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Bart Van Assche
BIN
www/Gentoo-HOWTO.pdf
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www/Gentoo-HOWTO.pdf
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www/bart_res.txt
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|
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Setup:
|
||||
|
||||
Target: 2.6.29 kernel, 64 bit, Intel E8400 CPU @ 3.00GHz, 4 GB RAM, SCST trunk
|
||||
revision 727 (which is close to the 1.0.1 release). A file of 1 GB residing
|
||||
on a tmpfs filesystem has been exported via SCST.
|
||||
|
||||
Initiator: 2.6.29 kernel, 64 bit, Intel E6750 CPU @ 2.66 GHz, 2 GB RAM,
|
||||
openSUSE 11.0 userspace.
|
||||
|
||||
Network: two MHGH28-XTC (MT26418) ConnectX InfiniBand HCA's connected back to
|
||||
back, which are DDR PCIe 1.0 HCA's. The IPoIB stack was configured with the
|
||||
default MTU of 2044 bytes on both interfaces and was using datagram mode.
|
||||
ib_read_bw reported a throughput of 1394 MB/s for this network, and netperf
|
||||
reported a TCP/IP throughput of 1200 MB/s (with default parameters).
|
||||
|
||||
Results:
|
||||
|
||||
Buffered I/O, block size of 512K (dd if=/dev/sdb of=/dev/null bs=512K):
|
||||
|
||||
write-test: iSCSI-SCST 243 MB/s; IET 192 MB/s.
|
||||
read-test: iSCSI-SCST 291 MB/s; IET 223 MB/s.
|
||||
|
||||
Buffered I/O, block size of 4 KB (dd if=/dev/sdb of=/dev/null bs=4K):
|
||||
|
||||
write-test: iSCSI-SCST 43 MB/s; IET 42 MB/s.
|
||||
read-test: iSCSI-SCST 288 MB/s; IET 221 MB/s.
|
||||
|
||||
Or: depending on the test scenario, SCST transfers data between 2% and
|
||||
30% faster via the iSCSI protocol over this network than IET.
|
||||
|
||||
Note: at least for the tests with a block size of 4 KB, the initiator
|
||||
system was the bottleneck, not the target system.
|
||||
|
||||
Something that is not relevant for this comparison, but interesting to
|
||||
know: with the SRP implementation in SCST the maximal read throughput
|
||||
is 1290 MB/s on the same setup.
|
||||
|
||||
Measured by Bart Van Assche
|
||||
|
||||
566
www/comparison.html
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www/comparison.html
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|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCSI targets comparison, iSCSI targets comparison">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCSI Targets Comparison</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li id="current"><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Comparison</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="comparison.html">Features comparison</a></li>
|
||||
<li><a href="scstvslio.html">SCST vs LIO/TCM</a></li>
|
||||
<li><a href="scstvsstgt.html">SCST vs STGT</a></li>
|
||||
<li><a href="mc_s.html">MC/S vs MPIO</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Features comparison between Linux SCSI targets</h1>
|
||||
|
||||
<p>This features comparison is intended to be a complete and fair feature-by-feature
|
||||
comparison between the listed targets without any bias to SCST. If you see anything
|
||||
wrong somewhere or anything missed, you are welcome to report it in scst-devel
|
||||
mailing list and it will be corrected.
|
||||
</p>
|
||||
|
||||
<p>Also Sebastian Riemer wrote a good summary in <a href="http://sourceforge.net/mailarchive/message.php?msg_id=30688206" rel="nofollow">his e-mail</a> (April 2013)</p>
|
||||
|
||||
<p><small>As on June 2011, briefly reviewed April 2013.</small></p>
|
||||
|
||||
<table bgcolor="#F0F0F0" border="1" cellspacing="1" cellpadding="7" style="text-align:center" width="620">
|
||||
|
||||
<tr>
|
||||
<td>
|
||||
</td><td><b><a href="http://scst.sourceforge.net/" title="http://scst.sourceforge.net/" rel="nofollow">SCST</a></b>
|
||||
</td><td><b><a href="http://stgt.sourceforge.net/" title="http://stgt.sourceforge.net/" rel="nofollow">STGT</a></b>
|
||||
</td><td><b><a href="http://iscsitarget.sourceforge.net/" title="http://iscsitarget.sourceforge.net/" rel="nofollow">IET</a></b>
|
||||
</td><td><b><a href="scstvslio.html">LIO/TCM</a></b>
|
||||
</td></tr>
|
||||
|
||||
<tr bgcolor="#E0E0E0">
|
||||
<td colspan="5"> <b>General</b>
|
||||
</td></tr>
|
||||
<tr>
|
||||
<td align="left"><b>Upstream kernel</b></td> <td> - </td> <td> - </td> <td> - </td> <td> <a href="scstvslio.html">Since 2.6.38</a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Generic Target Engine</b></td> <td> + </td> <td> + </td> <td> iSCSI only </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Architecture</b></td> <td> Kernel only</td> <td> User space only </td> <td> Split <sup>
|
||||
<A HREF="#1">1</A>
|
||||
</sup> </td> <td> Kernel only </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Stability</b></td> <td> + </td> <td> + </td> <td> + </td> <td> Probably </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Performance <sup><A HREF="#2">2</A></sup></b></td> <td> ***** <sup>
|
||||
<A HREF="#3">3</A>
|
||||
</sup></td> <td> ***</td> <td> **** </td> <td> ****- </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<th align="left"> Zero-copy passing data between target and
|
||||
backend drivers</th> <td> + <sup>
|
||||
<A HREF="#4">4</A>
|
||||
</sup></td> <td> + <sup>
|
||||
<A HREF="#5">5</A>
|
||||
</sup> </td> <td> + </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for transports without expecting
|
||||
transfer values (Wide (parallel) SCSI, SAS)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Interface with user space</b></td> <td> SysFS (or obsolete
|
||||
ProcFS)</td> <td> Custom </td> <td> - </td> <td> ConfigFS/IOCTL/ProcFS </td>
|
||||
</tr>
|
||||
|
||||
|
||||
<tr bgcolor="#E0E0E0">
|
||||
<td colspan="5"><b>Features</b>
|
||||
</td></tr>
|
||||
<tr>
|
||||
<td align="left"><b>Target drivers in kernel space</b></td> <td> + </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Target drivers in user space</b></td> <td>Via scst_local (e.g.
|
||||
using STGT
|
||||
pass-through)</td> <td> + </td> <td> - </td> <td>Via tcm_loop (e.g.
|
||||
using STGT pass-through)</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Backstorage handlers in kernel space</b></td> <td> + </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Backstorage handlers in user space</b></td> <td>+</td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Advanced devices access control
|
||||
<sup><A HREF="#7">7</A></sup></b></td> <td> + </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Automatic sessions reassignment (changes in the
|
||||
access control immediately seen by initiators)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for Asynchronous Event Notifications
|
||||
(AEN)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Notifications for devices added/removed or
|
||||
resized through AENs or Unit Attentions (initiators can instantly see
|
||||
any target reconfiguration in a PnP-like manner)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Bidirectional Commands</b></td> <td> +</td> <td> + </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Extended CDB (size >16 bytes)</b></td> <td> +</td> <td> + </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Descriptor sense support</b></td> <td> + </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>RESERVE/RELEASE
|
||||
(Windows 2003 clustering)</b></td> <td> + </td> <td> + </td> <td> + </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Safe RESERVE/RELEASE implementation according to
|
||||
SCSI requirements <sup><A HREF="#9">9</A></sup></b></td> <td> Safe </td> <td> Safe </td> <td> Safe from
|
||||
v1.4.18</td> <td> Not safe </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Safe implementation of Task Management commands
|
||||
<sup><A HREF="#10">10</A></sup></b></td> <td> Safe </td> <td> Not safe </td> <td> Not safe </td> <td> LUN RESET - safe.
|
||||
Other TM commands not
|
||||
implemented. </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for SCSI task attributes, including
|
||||
ORDERED commands</b></td> <td> + </td> <td> + </td> <td> -, <br> data
|
||||
corruption possible
|
||||
<sup><A HREF="#11">
|
||||
11</A></sup></td> <td> -, <br>data
|
||||
corruption possible
|
||||
<sup><A HREF="#11">
|
||||
11</A></sup> </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Persistent (SCSI-3) Reservations
|
||||
(Windows 2008 clustering / RHEL5 I/O fencing)</b></td> <td> + </td> <td> + <br> (not all
|
||||
functionality
|
||||
implemented)</td> <td> - </td> <td> + </td>
|
||||
<tr>
|
||||
<td align="left"><b>Durable, i.e. transactional, save of Persistent
|
||||
Through Power Loss Persistent Reservation data</b></td> <td> Durable </td> <td>Not supported</td> <td> - </td> <td> Not durable </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>ALUA</b></td> <td> +/- (Implicit
|
||||
only)<sup>
|
||||
<A HREF="#19">19</A>
|
||||
</sup> </td> <td> - </td> <td> - </td> <td> +/-<sup><A HREF="#19">
|
||||
19</A></sup></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Failover Clustering</b></td> <td> + </td> <td> + </td> <td> + </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Different threading models to choose the best
|
||||
performing</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>CPU affinity control</b></td> <td> + </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>I/O context grouping between I/O threads (big
|
||||
performance win with CFQ)</b></td> <td> + </td> <td> - </td> <td> + </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Per-initiator I/O context grouping (big
|
||||
performance and fairness win if several initiators access the same
|
||||
virtual or backend device on the target)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Protection against commands with
|
||||
wrong transfer size or transfer direction (may lead to crash or
|
||||
hard lockup of the target)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Protection against crashing target by making it
|
||||
to allocate too much memory for buffers and go into OOM state
|
||||
</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Caching of allocated buffers</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Latencies measurement facility</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Configuration tool with ability to automatically
|
||||
apply changes in the config file on fly without any restarts</b></td> <td> scstadmin </td> <td> - </td> <td> - </td> <td> rtsadmin? </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>SCSI MIBs</b></td> <td> - </td> <td> - </td> <td> - </td> <td> +-
|
||||
<sup><A HREF="#12">12</A></sup></td>
|
||||
</tr>
|
||||
|
||||
|
||||
<tr bgcolor="#E0E0E0">
|
||||
<td colspan="5"> <b>Supported transports and hardware</b>
|
||||
</td></tr>
|
||||
<tr>
|
||||
<td align="left"><b>iSCSI</b></td> <td> + </td> <td> + </td> <td> + </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>QLogic (Fibre Channel and FCoE)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> +</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Emulex (Fibre Channel and FCoE)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>SRP</b></td> <td> + </td> <td> - </td> <td> - </td> <td> Preliminary </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>iSER</b></td> <td> + </td> <td> + </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Marvell (SAS)</b></td> <td> Beta </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>FCoE</b></td> <td> + </td> <td>Under
|
||||
development</td> <td> - </td> <td> Alpha </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>LSI (Parallel (Wide) SCSI and Fibre Channel)
|
||||
</b></td> <td> Alpha </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>LSI (SAS)</b></td> <td> Preliminary
|
||||
(not completed) </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>IBM pSeries Virtual SCSI</b></td> <td> + </td> <td> + </td> <td> - </td> <td> Preliminary </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Local access to emulated backstorage devices
|
||||
<sup><A HREF="#6">6</A></sup></b></td> <td> scst_local </td> <td> - </td> <td> - </td> <td> tcm_loop </td>
|
||||
</tr>
|
||||
<tr bgcolor="#E0E0E0">
|
||||
<td colspan="5"> <b>Supported backstorage</b>
|
||||
</td></tr>
|
||||
<tr>
|
||||
<td align="left"><b>Kernel side FILEIO</b></td> <td> + </td> <td> - </td> <td> + </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Kernel side BLOCKIO</b></td> <td> + </td> <td> - </td> <td> + </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>User space FILEIO</b></td> <td> + </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>O_DIRECT FILEIO</b></td> <td> fileio_tgt </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Async FILEIO</b></td> <td> - </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Native RAMDISK</b></td> <td> - </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>SCSI pass-through
|
||||
<sup><A HREF="#13">13</A></sup></b></td> <td> + </td> <td> Single
|
||||
initiator only, not
|
||||
enforced<sup>
|
||||
<A HREF="#14">14</A>
|
||||
</sup> </td> <td> - </td> <td> Single initiator only, not enforced,
|
||||
limited functionality for tapes
|
||||
<sup><A HREF="#14">14</A></sup></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Zero-copy data read/write to/from backstorage
|
||||
</b></td> <td>BLOCKIO, user space
|
||||
FILEIO in O_DIRECT mode,
|
||||
pass-through <sup>
|
||||
<A HREF="#15">15</A>
|
||||
</sup></td> <td> - <sup>
|
||||
<A HREF="#5">5</A>
|
||||
</sup> </td> <td> BLOCKIO </td> <td> BLOCKIO, pass-
|
||||
through </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Cache safe<sup><A HREF="#8">8</A></sup>
|
||||
FILEIO</b></td> <td> Safe </td> <td>Safe only RDWR
|
||||
backend</td> <td> Safe </td> <td> Safe </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Cache safe<sup><A HREF="#8">8</A></sup>
|
||||
BLOCKIO</b></td> <td> Safe </td> <td> - </td> <td> Not safe </td> <td> Safe </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>4k sectors support in pass-through mode</b></td> <td> + </td> <td> - </td> <td> - </td> <td> ? </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>4k, 2k, 1k and 512 byte sectors emulation
|
||||
in modes, other than pass-through</b></td> <td> + </td> <td> + </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Virtual CD devices emulation from ISO files
|
||||
</b></td> <td> + </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Possibility to write to emulated from ISO files
|
||||
CD devices</b></td> <td> - </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Emulation of virtual tape and media changer
|
||||
devices (VTL)</b></td> <td> - </td> <td>Experimental</td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Thin provisioning support</b></td> <td>+<br></td> <td> ? </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
|
||||
<tr bgcolor="#E0E0E0">
|
||||
<td colspan="5"> <b>iSCSI Target</b>
|
||||
</td></tr>
|
||||
<tr>
|
||||
<td align="left"><b>Architecture</b></td> <td> Split <sup>
|
||||
<A HREF="#1">1</A>
|
||||
</sup> </td> <td> User space
|
||||
only </td> <td> Split <sup>
|
||||
<A HREF="#1">1</A>
|
||||
</sup></td> <td> Kernel only </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Interface with user space</b></td> <td>SysFS (or obsolete
|
||||
ProcFS)/
|
||||
IOCTL/Netlink</td> <td> - </td> <td>IOCTL/ProcFS/
|
||||
Netlink</td> <td> ConfigFS/IOCTL/ProcFS </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Zero-copy data send/receive</b></td> <td> Send only<sup>
|
||||
<A HREF="#16">16</A>
|
||||
</sup> </td> <td> In some cases,
|
||||
send only <sup>
|
||||
<A HREF="#5">5</A>
|
||||
</sup> </td> <td> Send only</td> <td> Send only </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b><a href="mc_s.html">Multiple connections per
|
||||
session (MS/C)</a></b></td> <td> - </td> <td> - </td> <td>+</td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Max ErrorRecoveryLevel</b></td> <td> 0 </td> <td> 0 </td> <td> 0 </td> <td> 2 </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for limiting number of initiators
|
||||
allowed to connect to a target</b></td> <td> + </td> <td> - </td> <td> + </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Per-portal targets visibility control</b></td> <td> + </td> <td> - </td> <td> + </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Per-initiators targets visibility control</b></td> <td> + </td> <td> + </td> <td> + </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for AHS</b></td> <td> + </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for iSCSI redirects</b></td> <td> + </td> <td> + </td> <td> + </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Bidirectional Commands</b></td> <td> + </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Extended CDB (size >16 bytes)</b></td> <td> + </td> <td> + </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for AENs (initiators can instantly see any
|
||||
target reconfiguration in a PnP-like manner)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for iSNS</b></td> <td> + </td> <td> + </td> <td> + </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Safe implementation of Task Management commands
|
||||
<sup><A HREF="#10">10</A></sup></b></td> <td> Safe </td> <td> Not safe </td> <td> Not safe </td> <td> ABORT TASK - not safe,
|
||||
LUN RESET - safe,
|
||||
other TM commands not
|
||||
implemented. </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Safe implementation of connections and sessions
|
||||
reinstatement <sup><A HREF="#17">17</A></sup></b></td> <td> Safe </td> <td> Not safe </td> <td> Not safe </td> <td> Not safe </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Usage of hardware instructions for digest
|
||||
calculations, if available</b></td> <td> + </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Each connection multithreaded digest calculation
|
||||
</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Safe restart <sup><A HREF="#18">18</A></sup>
|
||||
</b></td> <td> Safe </td> <td> ? </td> <td> Not safe before
|
||||
v1.4.18. After -
|
||||
probably safe.</td> <td> ?</td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>iSCSI MIBs</b></td> <td> - </td> <td> - </td> <td> - </td> <td> +-
|
||||
<sup><A HREF="#12">12</A></sup></td>
|
||||
</tr>
|
||||
<tr bgcolor="#E0E0E0">
|
||||
<td colspan="5"> <b>Local access target</b>
|
||||
</td></tr>
|
||||
<tr>
|
||||
<td align="left"><b>Bidirectional support</b></td> <td> + </td> <td> - </td> <td> - </td> <td> + </td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td align="left"><b>Support for AENs (initiators can instantly see any
|
||||
target reconfiguration in a PnP-like manner)</b></td> <td> + </td> <td> - </td> <td> - </td> <td> - </td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<br>
|
||||
<p><strong><big><u>REMARKS:</u></big></strong></p>
|
||||
|
||||
<p><A NAME="1"></A> 1. All iSCSI management implemented in user space and actual data transfers in kernel space without user space involved.</p>
|
||||
|
||||
<p><A NAME="2"></A> 2. The result "in average" is listed. One target can be better somewhere, another one somewhere else. Although manual tuning of target and
|
||||
system parameters tends the restore the difference listed in the comparison. You can find example measurements <a href="vl_res.txt">here</a>,
|
||||
<a href="bart_res.txt">here</a> and <a href="tomasz_res.txt">here</a>.</p>
|
||||
|
||||
<p><A NAME="3"></A> 3. All SCST and its drivers' kernel patches supposed to be applied and SCST with the drivers built in the release or performance build.
|
||||
Without the kernel patches SCST performance will be at "****+" level, except for the case, when user space backstorage handler used
|
||||
with iSCSI-SCST iSCSI target driver, where performance will be at "***+" level.</p>
|
||||
|
||||
<p><A NAME="4"></A> 4 In SCST data are always passed in zero-copy manner between target and backend drivers without need for any
|
||||
additional kernel patches, except in case, when local access (scst_local) used with user space backend. </p>
|
||||
|
||||
<p><A NAME="5"></A> 5. Some zero-copy functionality isn't available from user space, sometimes fundamentally.
|
||||
For instance, zero-copy FILEIO with page cache or zero-copy send to a socket. Also STGT can't use splice() for in-kernel
|
||||
target drivers, because it has memory management in user space. To use splice() with socket-based user space target drivers
|
||||
STGT would need a deep redesign of internal interactions between target drivers, core and backend handlers. But in
|
||||
some cases STGT can use zero-copy sendfile().</p>
|
||||
|
||||
<p><A NAME="6"></A> 6. "Local access to emulated backstorage devices" means that you can access emulated by a SCSI target devices
|
||||
locally on the target host. For instance, you can mount your ISO image from emulated by the target
|
||||
CDROM device locally on the target host.</p>
|
||||
|
||||
<p><A NAME="7"></A> 7. "Advanced devices access control" means that different initiators can see different sets
|
||||
of devices from the same target. This feature is required for hardware targets, which don't have ability
|
||||
to create virtual targets.</p>
|
||||
|
||||
<p><A NAME="8"></A> 8. "Cache safe" means that cache synchronization commands (SYNCHRONIZE_CACHE and FUA attribute) from initiators perform
|
||||
what they expected to perform, i.e. push all the requested blocks from all caches, including devices' caches,
|
||||
to non-volatile media.</p>
|
||||
|
||||
<p><A NAME="9"></A> 9. SCSI requires that if an initiator clears reservation held by another initiator, the reservation holder must be notified
|
||||
about the reservation clearance. Otherwise, several initiators can at the same time change supposed to be protected by the
|
||||
reservation data, which can corrupt them. This is what was called
|
||||
<a href="http://communities.vmware.com/thread/53797?tstart=0&start=15">"Russian roulette with your data"</a> on the VMware
|
||||
community forum by someone working for VMware. But, sure, it can affect not only VMware, but also any other cluster
|
||||
implementation, relying on this functionality.</p>
|
||||
|
||||
<p><A NAME="10"></A> 10. After a task management command completed and before the corresponding response was sent to the initiator, who sent that task management
|
||||
command, all the affected SCSI commands must get into a state, where they can't affect following after
|
||||
the tasks management response commands from this initiator. This is the safe implementation.
|
||||
The unsafe implementation only marks all the affected
|
||||
SCSI commands as aborted and then immediately send task management response to the initiator. This implementation only
|
||||
guarantees that the initiator will never receive responses from those commands, but it doesn't
|
||||
guarantee that none of those commands will get executed by backstorage <strong>*AFTER*</strong> any
|
||||
SCSI command, which initiator will send after it received the task management response thinking
|
||||
that all the aborted commands actually fully aborted. This could lead to a data corruption.</p>
|
||||
|
||||
<p><A NAME="11"></A> 11. Both IET and LIO report in INQUIRY command response support for full task management model. But they process ORDERED
|
||||
commands the same way as SIMPLE commands, i.e. allow free reorder of them before they get executed. That violates SCSI standard
|
||||
and can lead to a data corruption to any application relying on commands order provided by ORDERED attribute.</p>
|
||||
|
||||
<p><A NAME="12"></A> 12. LIO exports the information needed for an RFC 4455 implementation, but requires additional RFC 4455 implementing module.
|
||||
At the moment, there is no open source implementation of such module.</p>
|
||||
|
||||
<p><A NAME="13"></A> 13. SCSI pass-through mode allows to export your local SCSI-capable device. For instance with it you can share your parallel
|
||||
SCSI tape or SATA DVD-RW device to your iSCSI network.</p>
|
||||
|
||||
<p><A NAME="14"></A> 14. STGT and LIO don't emulate all the necessary SCSI host functionality to allow to share SCSI devices
|
||||
in pass-through mode to several initiators, although LIO has some necessary processing, but not all.
|
||||
They can only pass SCSI commands from initiators to
|
||||
SCSI devices and responses back. This is safe only with a single initiator. This limitation
|
||||
isn't enforced anyhow and both STGT and LIO don't issue any warning about it, so an user will not be notified about this
|
||||
limitation and can quietly corrupt his/her data. You can find more technical information about it
|
||||
<a href="http://www.mail-archive.com/linux-scsi@vger.kernel.org/msg06911.html">here</a>.
|
||||
Also LIO in pass-through mode doesn't do necessary sense processing for tape devices to
|
||||
correctly return residual information, so tapes can used with it with limited functionality.</p>
|
||||
|
||||
<p><A NAME="15"></A> 15. You can find a proposal how to implement zero-copy FILEIO in SCST on the <a href="contributing.html#ZC_READ">
|
||||
Contributing</a> page.</p>
|
||||
|
||||
<p><A NAME="16"></A> 16. Doesn't need any kernel patch, except in the case, when used with user space backend.</p>
|
||||
|
||||
<p><A NAME="17"></A> 17. Connections and sessions reinstatement is, basically, a kind of Task Management command, because it implies commands aborting.
|
||||
So, similarly to the safe task management above, a safe implementation of connections and sessions reinstatement
|
||||
must not accept SCSI commands from new connection/session until all the SCSI commands in
|
||||
being reinstated connection/session get into a state, where they can't affect new commands.</p>
|
||||
|
||||
<p><A NAME="18"></A> 18. "Safe restart" means that after the iSCSI target restart, all the connected initiators will seamlessly restore all existing before
|
||||
the restart connections. "Not safe" means that, most likely, the connected initiators will fail to restore
|
||||
existing connections with some errors. However, your iSCSI initiator also should be able to handle the safe restart. For instance,
|
||||
old (pre-CentOS/RHEL 5) open-iscsi has problems in this area. But the latest versions do it pretty well.</p>
|
||||
|
||||
<p><A NAME="19"></A> 19. Generic implementation, i.e. not coupled to any particular cluster implementation, which means it is needed additional effort
|
||||
to used with each particular cluster setup.</p>
|
||||
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- wrap ends here -->
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018 <b><font color="#EC981F">Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font color="#EC981F">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
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||||
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|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
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|
||||
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|
||||
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|
||||
</html>
|
||||
229
www/contributing.html
Normal file
229
www/contributing.html
Normal file
@@ -0,0 +1,229 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCST Contributing</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li id="current"><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div id="content-wrap">
|
||||
<div id="main">
|
||||
<h1>Contributing to SCST</h1>
|
||||
|
||||
<p>If you would like to contribute to SCST development, you can do in many ways:</p>
|
||||
|
||||
<ul>
|
||||
<li><span>By sending <a href="http://sourceforge.net/donate/index.php?group_id=110471">donations</a>.
|
||||
They will be spent on further work making SCST better, including buying new hardware, as well as on providing
|
||||
better support and troubleshooting for you. If you want to donate another amount, than listed on the
|
||||
provided buttons, you can directly edit URL they are pointing to.</span></li>
|
||||
<li><span>By sending patches, which fix bugs or implement new functionality.
|
||||
See below a list of possible SCST improvements with some possible
|
||||
implementation ideas.</span></li>
|
||||
<li><span>By writing or updating various documentation to keep it complete and up to date.
|
||||
For instance, <a href="scst_pg.html">SCST internals description</a> document is
|
||||
in some areas quite outdated. Particularly, many functions were renamed since
|
||||
time, when it was written. It would be good to bring it up to date.</span></li>
|
||||
<li><span>By reporting bugs or other problems.</span></li>
|
||||
</ul>
|
||||
|
||||
<h1>Possible SCST extensions and improvements</h1>
|
||||
|
||||
<A NAME="ASYNC_FILEIO"></A><h3>Asynchronous FILEIO in scst_vdisk handler</h3>
|
||||
|
||||
<p>At the moment scst_vdisk handler for FILEIO uses regular synchronous read/write() calls
|
||||
and makes deep queue depth by using multiple threads. This is not too high performance
|
||||
model of operations. It would be much better to use asynchronous I/O with not blocking
|
||||
I/O calls.</p>
|
||||
|
||||
<p>In the user space native AIO is available for many years, but only very recently ability to
|
||||
use it was added in the kernel. Changing FILEIO to use the new interface should significantly
|
||||
(up to multiple times) increase performance of FILEIO devices.</p>
|
||||
|
||||
<A NAME="O_DIRECT"></A><h3>Support for O_DIRECT in scst_vdisk handler</h3>
|
||||
|
||||
<p>At the moment, scst_vdisk handler doesn't support O_DIRECT option and possibility to set it
|
||||
was disabled. This limitation caused by Linux kernel expectation that memory supplied to
|
||||
read() and write() functions with O_DIRECT flag is mapped to some user space application.
|
||||
Having O_DIRECT together with above asynchronous FILEIO would be another significant
|
||||
performance boost for modern solid state devices. For instance, in fio utility
|
||||
direct AIO long ago proven to be the fastest way to benchmark storage.</p>
|
||||
|
||||
<p>It is relatively easy to remove that limitation. Function dio_refill_pages()
|
||||
should be modified to check before calling get_user_pages() if current->mm is not NULL.
|
||||
If it is NULL, then, instead of calling get_user_pages(), dio->pages should be filled
|
||||
by pages, taken directly from dio->curr_user_address. Each such page should be referenced
|
||||
by page_cache_get(). That's all.</p>
|
||||
|
||||
<A NAME="SG_LIMIT"></A><h3>Solve SG IO count limitation issue in pass-through mode</h3>
|
||||
|
||||
<p>In the pass-through mode (i.e. using the pass-through device handlers like
|
||||
scst_tape, etc.) SCSI commands, coming from remote initiators,
|
||||
are passed to local SCSI hardware on target as is, without any
|
||||
modifications. As any other hardware, the local SCSI hardware can not
|
||||
handle commands with amount of data and/or segments count in
|
||||
scatter-gather array bigger some values. For some commands SCST can
|
||||
split them on subcommands and, hence, workaround this problem, but it isn't
|
||||
always possible. For instance, for tapes splitting write commands may mean
|
||||
corrupting the tape data.</p>
|
||||
|
||||
<p>If you have this issue you will see
|
||||
symptoms like small transfers work well, but large transfers stall and
|
||||
messages like: "Unable to complete command due to SG IO count
|
||||
limitation" are printed in the kernel logs.</p>
|
||||
|
||||
<p>The only complete way to fix this problem is to allocate data buffers with number
|
||||
of entries inside the SG IO count limitation. In <a href="sgv_big_order_alloc.diff">sgv_big_order_alloc.diff</a>
|
||||
you can find a possible way to solve this issue.</p>
|
||||
|
||||
<p>You can also look at patch
|
||||
<a href="sgv_big_order_alloc-sfw5-rc3.diff">sgv_big_order_alloc-sfw5-rc3.diff</a>
|
||||
created by Frank Zago for SCST 2.0.0. It was submitted too late to be included in it.
|
||||
Update for SCST trunk is welcome!</p>
|
||||
|
||||
<p>Note, scst_disk handler already implements a workaround for it.</p>
|
||||
|
||||
<A NAME="MEM_REG"></A><h3>Memory registration</h3>
|
||||
|
||||
<p>In some cases a target driver might need to register memory used for data buffers in the
|
||||
hardware. At the moment, none of SCST target drivers, including InfiniBand SRP target driver,
|
||||
need that feature. But in case if in future there is a need in such a feature, it can be easily
|
||||
added by extending SCST SGV cache. The SCST SGV cache is a memory management
|
||||
subsystem in SCST. It doesn't free to the system each data buffer,
|
||||
which is not used anymore, but keeps it for a while to let it be reused by the
|
||||
next consecutive command to reduce command processing latency and, hence, improve performance.</p>
|
||||
|
||||
<p>To support memory buffers registrations, it can be extended by the following way:</p>
|
||||
|
||||
<p>1. Struct scst_tgt_template would be extended to have 2 new callbacks:</p>
|
||||
|
||||
<ul>
|
||||
|
||||
<li><span>int register_buffer(struct scst_cmd *cmd)</span></li>
|
||||
|
||||
<li><span>int unregister_buffer(unsigned long mem_priv, void *scst_priv)</span></li>
|
||||
|
||||
</ul>
|
||||
|
||||
<p>2. SCST core would be extended to have 4 new functions:</p>
|
||||
|
||||
<ul>
|
||||
|
||||
<li><span>int scst_mem_registered(struct scst_cmd *cmd)</span></li>
|
||||
|
||||
<li><span>int scst_mem_deregistered(void *scst_priv)</span></li>
|
||||
|
||||
<li><span>int scst_set_mem_priv(struct scst_cmd *cmd, unsigned long mem_priv)</span></li>
|
||||
|
||||
<li><span>unsigned long scst_get_mem_priv(struct scst_cmd *cmd)</span></li>
|
||||
|
||||
</ul>
|
||||
|
||||
<p>3. The workflow would be the following:</p>
|
||||
|
||||
<ol>
|
||||
<li><span>If target driver defined register_buffer() and unregister_buffer() callbacks,
|
||||
SCST core would allocate a dedicated SGV cache for each instance of struct scst_tgt,
|
||||
i.e. target.</span></li>
|
||||
|
||||
<li><span>When there would be an SGV cache miss in memory buffer for a command allocation,
|
||||
SCST would check if register_buffer() callback was defined in the target driver's template
|
||||
and, if yes, would call it.</span></li>
|
||||
|
||||
<li><span>In register_buffer() callback the target driver would do necessary actions to
|
||||
start registration of the commands memory buffer.</span></li>
|
||||
|
||||
<li><span>Upon register_buffer() callback returns, SCST core would suspend processing the
|
||||
corresponding command and would switch to the next commands processing.</span></li>
|
||||
|
||||
<li><span>After the memory registration finished, the target driver would call scst_set_mem_priv()
|
||||
to associate the memory buffer with some internal data.</span></li>
|
||||
|
||||
<li><span>Then the target driver would call scst_mem_registered() and SCST would resume processing
|
||||
the command. Functions scst_set_mem_priv() and scst_mem_registered() can be called from inside register_buffer().
|
||||
In this case SCST core would continue processing the command immediately without suspending.</span></li>
|
||||
|
||||
<li><span>After the command finished, the corresponding memory buffer would remain in the
|
||||
SGV cache in the registered state and would be reused by the next commands. For each of them
|
||||
the target driver can at any time figure out the associated with the registered buffer data
|
||||
by using scst_get_mem_priv().</span></li>
|
||||
|
||||
<li><span>When the SGV cache decide that there is a time to free the memory buffer, it would
|
||||
call the target driver's unregister_buffer() callback.</span></li>
|
||||
|
||||
<li><span>In this callback the target driver would do necessary actions to start deregistration of the
|
||||
commands memory buffer.</span></li>
|
||||
|
||||
<li><span>Upon unregister_buffer() callback returns, SGV cache would suspend freeing the corresponding buffer
|
||||
and would switch to other deals it has.</span></li>
|
||||
|
||||
<li><span>After the memory deregistration finished, the target driver would call scst_mem_deregistered()
|
||||
and pass to it scst_priv pointer, received in unregister_buffer(). Then the memory buffer
|
||||
would be freed by the SGV cache. Function scst_mem_deregistered() can be called from inside unregister_buffer().
|
||||
In this case SGV cache would free the buffer immediately without suspending.
|
||||
</span></li>
|
||||
</ol>
|
||||
|
||||
<A NAME="NON_SCSI_TGT"></A><h3>SCST usage with non-SCSI transports</h3>
|
||||
|
||||
<p>SCST might also be used with non-SCSI speaking transports, like NBD or AoE. Such cooperation
|
||||
would allow them to use SCST-emulated backend.</p>
|
||||
|
||||
<p>For user space targets this is trivial: they simply should use SCST-emulated devices locally
|
||||
via scst_local module.</p>
|
||||
|
||||
<p>For in-kernel non-SCSI target driver it's a bit more complicated. They should implement a small layer,
|
||||
which would translate their internal READ/WRITE requests to corresponding SCSI commands and, on the
|
||||
way back, SCSI status and sense codes to their internal status codes.</p>
|
||||
|
||||
<A NAME="GET_CONFIGURATION"></A><h3>GET CONFIGURATION command</h3>
|
||||
|
||||
<p>SCSI command GET CONFIGURATION is mandatory for SCSI multimedia devices, like CD/DVD-ROMs or
|
||||
recorders, see MMC standard. Currently SCST lacks support for it, which leads to problems
|
||||
with some programs depending on the result of GET CONFIGURATION command execution.</p>
|
||||
|
||||
<p>It would be good to add support for it in the SCST core.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- wrap ends here -->
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018 <b><font color="#EC981F">Vladislav Bolkhovitin & others</font></b>
|
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Design by: <b><font color="#EC981F">Daniel Fernandes</font></b> </p>
|
||||
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|
||||
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|
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|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
|
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<head>
|
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<meta name="Keywords" content="Generic SCSI Target Subsystem for Linux">
|
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<meta name="Robots" content="index,follow">
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<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
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|
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</head>
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<body>
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<div id="wrap">
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<div id="header">
|
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<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
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<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
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</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li id="current"><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
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<li><a href="comparison.html">Comparison</a></li>
|
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<li><a href="users.html">Users</a></li>
|
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</ul>
|
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|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="main">
|
||||
<h1>SCST Downloads</h1>
|
||||
|
||||
<p>The latest stable version of SCST is 3.3.
|
||||
The latest updates for that version are
|
||||
available on the 3.3.x branch in the SVN
|
||||
repository.</p>
|
||||
|
||||
<p>You can also download prebuilt SCST modules for
|
||||
<a href="http://linuxsoft.cern.ch/cern/slc5X/x86_64/yum/extras/repoview">Scientific Linux CERN 5</a> (RHEL5-based),
|
||||
<a href="https://launchpad.net/~ast/+archive/scst2">Ubuntu</a>,
|
||||
<a href="http://www.motschke.de/debian/packages">Debian</a>,
|
||||
<a href="http://alpine.nethq.org/distfiles/alpine-scst-110210-x86_64.iso">Alpine Linux</a> and
|
||||
<a href="http://download.opensuse.org/repositories/home:/oertel/">openSUSE</a>
|
||||
(<a href="https://build.opensuse.org/package/view_file?file=scst.spec&package=scst&project=home%3Aoertel">spec</a>).</p>
|
||||
|
||||
<p>Since recently, SCST allows to build Debian packages using "make dpkg" command. Previous instructions how to build
|
||||
SCST DKMS package for Debian-based systemd-enabled Linuxes you can find
|
||||
<a href="https://sites.google.com/site/nandydandyoracle/scst/scst-debian-dkms-package-build-from-source-ubuntu-17-04">here</a>.</p>
|
||||
|
||||
<p>As a complete SCST-based system you can try <a href="http://www.esos-project.com/">Enterprise Storage OS (ESOS)</a>.</p>
|
||||
|
||||
<p>There is also a well done user space port, which you can find <a href="https://github.com/DavidButterfield/SCST-Usermode-Adaptation">here</a>.</p>
|
||||
|
||||
<p>The latest development version of SCST is 3.4. You can download it as well as target drivers and user space
|
||||
utilities directly from the SCST SVN. You can access it using either
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/trunk">web-based SVN repository viewer</a> or using anonymous access:</p>
|
||||
|
||||
<p><code>svn checkout svn://svn.code.sf.net/p/scst/svn/trunk scst-trunk</code></p>
|
||||
|
||||
<p>Also you can find in the SCST SVN the latest updates for the stable branches. More information about accessing SVN repository may be found
|
||||
<a href="https://sourceforge.net/p/forge/documentation/svn/">here</a>. Or, alternatively, you can download it as a GNU tarball from
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tarball?path=/branches/3.3.x">here</a>.</p>
|
||||
|
||||
<p>History of the pre-SVN SCST development is available in SCST CVS repository, which is accessible using
|
||||
<a href="http://scst.cvs.sourceforge.net">web-based CVS repository viewer</a>, or anonymous CVS access.</p>
|
||||
|
||||
<p class="post-footer align-right">
|
||||
<a href="http://sourceforge.net/project/showfiles.php?group_id=110471" class="readmore">Download released versions</a>
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
<a href="https://github.com/bvanassche/scst" class="readmore">Official git mirror</a>
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
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|
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97
www/handler_fileio_tgt.html
Normal file
97
www/handler_fileio_tgt.html
Normal file
@@ -0,0 +1,97 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCSI target in user space">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>FILEIO Target SCST Handler</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
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|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>FILEIO_TGT handler</h1>
|
||||
|
||||
<p>User space program fileio_tgt uses interface of SCST's scst_user dev
|
||||
handler and allows to see how it works in various modes.
|
||||
Fileio_tgt provides mostly the same functionality as the kernel space
|
||||
SCST's scst_vdisk handler with the only exceptions that it supports
|
||||
O_DIRECT mode and doesn't support BLOCKIO one. O_DIRECT mode is
|
||||
basically the same as BLOCKIO, but also supports files, so for some
|
||||
loads it could be significantly faster, than the regular FILEIO access.
|
||||
All the words about BLOCKIO mode from SCST's README file apply to
|
||||
O_DIRECT mode as well.</p>
|
||||
|
||||
<p>You can find the latest development version of this handler in the SCST SVN. See the download page how to setup
|
||||
access to it.</p>
|
||||
<p class="post-footer align-right">
|
||||
<a href="downloads.html" class="readmore">Download</a>
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018 <b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
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BIN
www/images/LPe16002.jpg
Normal file
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Normal file
Binary file not shown.
|
After Width: | Height: | Size: 13 KiB |
357
www/images/Orange.css
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357
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|
||||
* { margin: 0; padding: 0; }
|
||||
|
||||
body {
|
||||
margin: 0; padding: 0;
|
||||
font: 71%/1.5em Verdana, 'Trebuchet MS', Arial, Sans-serif;
|
||||
background: url(headerbg-orange.gif) repeat-x;
|
||||
color: #666666;
|
||||
text-align: center;
|
||||
}
|
||||
|
||||
/* links */
|
||||
a {
|
||||
background: inherit;
|
||||
color: #EC981F;
|
||||
}
|
||||
a:hover {
|
||||
background: inherit;
|
||||
color: #806B4D;
|
||||
}
|
||||
|
||||
/* headers */
|
||||
h1, h2, h3, .companysubtitles {
|
||||
font: bold 1em 'Trebuchet MS', Tahoma, Sans-serif;
|
||||
text-transform: uppercase;
|
||||
color: #555;
|
||||
}
|
||||
h1 { font-size: 1.5em; }
|
||||
h2 { font-size: 1.3em; }
|
||||
h3 { font-size: 1.2em; text-transform: none;}
|
||||
.companysubtitles { font-size: 1.3em; }
|
||||
|
||||
#main h1, #rightbar h1 {
|
||||
padding: 10px 0 5px 5px;
|
||||
margin: 0 0 0 10px;
|
||||
text-transform: uppercase;
|
||||
border-bottom: 1px solid #f2f2f2;
|
||||
}
|
||||
#sidebar h1 {
|
||||
padding: 10px 0px 5px 30px;
|
||||
background: url(square_arrow.gif) no-repeat 2px 12px;
|
||||
margin: 0;
|
||||
text-transform: uppercase;
|
||||
}
|
||||
|
||||
p, h1, h2, h3, h4, .companysubtitles { margin: 10px 15px; }
|
||||
|
||||
ul, ol {
|
||||
margin: 10px 30px;
|
||||
padding: 0 15px;
|
||||
color: #EC981F;
|
||||
}
|
||||
|
||||
ul span, ol span { color: #666666; }
|
||||
|
||||
/* images */
|
||||
/* img { border: 2px solid #CCC; } */
|
||||
img.float-right { margin: 5px 0px 5px 15px; }
|
||||
img.float-left { margin: 5px 15px 5px 0px; }
|
||||
|
||||
a img { border: 0px solid #EC981F; }
|
||||
a:hover img { border: 0px solid #806B4D !important;border: 0px solid #EC981F; }
|
||||
|
||||
code {
|
||||
margin: 5px 0;
|
||||
padding: 10px;
|
||||
text-align: left;
|
||||
display: block;
|
||||
overflow: auto;
|
||||
font: 500 1em/1.5em 'Lucida Console', 'courier new', monospace;
|
||||
background: #FAFAFA;
|
||||
border: 1px solid #f2f2f2;
|
||||
border-left: 3px solid #EC981F;
|
||||
}
|
||||
|
||||
acronym { cursor: help;border-bottom: 1px solid #777; }
|
||||
|
||||
blockquote {
|
||||
margin: 15px;
|
||||
padding: 0 0 0 32px;
|
||||
background: #FAFAFA url(quote.gif) no-repeat 5px 10px !important;
|
||||
background-position: 8px 10px;
|
||||
border: 1px solid #f2f2f2;
|
||||
border-left: 3px solid #EC981F;
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
/* form elements */
|
||||
form {
|
||||
margin:10px; padding: 0;
|
||||
border: 1px solid #f2f2f2;
|
||||
background-color: #FAFAFA;
|
||||
}
|
||||
label {
|
||||
display:block;
|
||||
font-weight:bold;
|
||||
margin:5px 0;
|
||||
}
|
||||
input {
|
||||
padding: 4px;
|
||||
border:1px solid #eee;
|
||||
font: normal 1em/1.5em Verdana, sans-serif;
|
||||
color:#777;
|
||||
}
|
||||
textarea {
|
||||
width:350px;
|
||||
padding:4px;
|
||||
font: normal 1em/1.5em Verdana, sans-serif;
|
||||
border:1px solid #eee;
|
||||
height:100px;
|
||||
display:block;
|
||||
color:#777;
|
||||
}
|
||||
input.button {
|
||||
margin: 0;
|
||||
font: bold 1em Arial, Sans-serif;
|
||||
border: 1px solid #CCC;
|
||||
background: #FFF;
|
||||
padding: 2px 3px;
|
||||
color: #333;
|
||||
}
|
||||
|
||||
/* search form */
|
||||
form.searchform {
|
||||
background: transparent;
|
||||
border: none;
|
||||
margin: 0; padding: 0;
|
||||
}
|
||||
form.searchform input.textbox {
|
||||
margin: 0;
|
||||
width: 120px;
|
||||
border: 1px solid #CCC;
|
||||
background: #FFF;
|
||||
color: #333;
|
||||
vertical-align: top;
|
||||
}
|
||||
form.searchform input.button {
|
||||
width: 55px;
|
||||
vertical-align: top;
|
||||
}
|
||||
|
||||
/*****************/
|
||||
/* Layout */
|
||||
/*****************/
|
||||
#wrap {
|
||||
margin: 0 auto;
|
||||
width: 908px;
|
||||
text-align: left;
|
||||
background: #FFF;
|
||||
}
|
||||
#content-wrap {
|
||||
clear:both;
|
||||
margin: 0; padding:0;
|
||||
width: 908px;
|
||||
}
|
||||
|
||||
/* header */
|
||||
#header {
|
||||
position: relative;
|
||||
background: url(headerbg-orange.gif) repeat-x 0% 0%;
|
||||
height: 84px;
|
||||
}
|
||||
|
||||
div.logoimg {
|
||||
position: relative;
|
||||
background: url(logo.gif) no-repeat;
|
||||
top: 15px;
|
||||
height: 50px;
|
||||
}
|
||||
|
||||
#header h1#logo {
|
||||
position: absolute;
|
||||
margin: 0; padding: 0;
|
||||
font: bolder 4.1em 'Trebuchet MS', Arial, Sans-serif;
|
||||
letter-spacing: -2px;
|
||||
color: #CCC;
|
||||
/*text-transform: lowercase;*/
|
||||
/* change the values of top and Left to adjust the position of the logo*/
|
||||
top: 0; left: 55px;
|
||||
}
|
||||
#header h2#slogan {
|
||||
position: absolute;
|
||||
margin: 0; padding: 0;
|
||||
font: bold 2em 'Trebuchet MS', Arial, Sans-serif;
|
||||
text-transform: none;
|
||||
color: #FFF;
|
||||
/* change the values of top and Left to adjust the position of the slogan*/
|
||||
top: 30px; left:65px;
|
||||
}
|
||||
#header .searchform {
|
||||
position: absolute;
|
||||
top: 5px; right: 3px;
|
||||
}
|
||||
|
||||
/* main column */
|
||||
#main {
|
||||
float: left;
|
||||
margin-left: 15px;
|
||||
padding: 0;
|
||||
/*width: 54%;*/
|
||||
width: 72%;
|
||||
/*border-left: 1px solid #f2f2f2;
|
||||
*/
|
||||
}
|
||||
|
||||
#main2 {
|
||||
float: left;
|
||||
margin-left: 15px;
|
||||
padding: 0;
|
||||
width: 96%;
|
||||
}
|
||||
|
||||
.post-footer {
|
||||
background-color: #FAFAFA;
|
||||
padding: 5px; margin-top: 20px;
|
||||
font-size: 95%;
|
||||
border: 1px solid #f2f2f2;
|
||||
}
|
||||
.post-footer .date {
|
||||
background: url(clock.gif) no-repeat left center;
|
||||
padding-left: 20px; margin: 0 10px 0 5px;
|
||||
}
|
||||
.post-footer .comments {
|
||||
background: url(comment.gif) no-repeat left center;
|
||||
padding-left: 20px; margin: 0 10px 0 5px;
|
||||
}
|
||||
.post-footer .readmore {
|
||||
background: url(page.gif) no-repeat left center;
|
||||
padding-left: 20px; margin: 0 10px 0 5px;
|
||||
}
|
||||
|
||||
/* sideabar */
|
||||
#sidebar {
|
||||
float: left;
|
||||
width: 24%;
|
||||
margin: 0; padding: 0;
|
||||
display: inline;
|
||||
}
|
||||
#sidebar ul.sidemenu {
|
||||
list-style: none;
|
||||
text-align: left;
|
||||
margin: 0 0 8px 0;
|
||||
padding-right: 0;
|
||||
text-decoration: none;
|
||||
}
|
||||
#sidebar ul.sidemenu li {
|
||||
border-bottom: 1px solid #EFF0F1;
|
||||
background: url(arrow.gif) no-repeat 2px 5px;
|
||||
padding: 2px 5px 2px 20px;
|
||||
}
|
||||
|
||||
* html body #sidebar ul.sidemenu li { height: 1%; }
|
||||
|
||||
#sidebar ul.sidemenu a {
|
||||
font-weight: bold;
|
||||
background-image: none;
|
||||
text-decoration: none;
|
||||
}
|
||||
|
||||
/* rightbar */
|
||||
#rightbar {
|
||||
float: right;
|
||||
width: 24%;
|
||||
padding: 0; margin: 0;
|
||||
}
|
||||
|
||||
/* footer */
|
||||
#footer {
|
||||
clear: both;
|
||||
background: #FFF url(footerbg.gif) repeat-x left top;
|
||||
border-top: 1px solid #F2F2F2;
|
||||
text-align: center;
|
||||
height: 50px;
|
||||
}
|
||||
#footer a {
|
||||
text-decoration: none;
|
||||
font-weight: bold;
|
||||
}
|
||||
|
||||
/* menu */
|
||||
#menu {
|
||||
clear: both;
|
||||
margin: 0; padding: 0;
|
||||
}
|
||||
#menu ul {
|
||||
position: relative;
|
||||
bottom: 4px;
|
||||
margin: 0; padding: 0;
|
||||
float: left;
|
||||
font: bold 1.4em 'Trebuchet MS', Tahoma, Arial, Sans-serif;
|
||||
width: 850px;/* 775px; */
|
||||
border: 1px solid #808080;
|
||||
border-width: 0 0 4px 0;
|
||||
list-style: none;
|
||||
}
|
||||
#menu ul li{
|
||||
display: inline;
|
||||
}
|
||||
#menu ul li a {
|
||||
position: relative; bottom: -4px;
|
||||
float: left;
|
||||
color: #808080;
|
||||
padding: 0px 10px;
|
||||
text-decoration: none;
|
||||
background: white url(menudivide.gif) repeat-y right top;
|
||||
border-bottom: 4px solid #808080;
|
||||
}
|
||||
#menu ul li a:hover{
|
||||
color: black;
|
||||
background-color: #F3F3F3;
|
||||
border-bottom: 4px solid #FFA600;
|
||||
}
|
||||
#menu ul li#current a{
|
||||
color: #333;
|
||||
background-color: #F3F3F3;
|
||||
border-bottom: 4px solid #FFA600;
|
||||
}
|
||||
#menu ul li#sponsorship a{
|
||||
color: red;
|
||||
}
|
||||
#menu ul li#sp_current a{
|
||||
color: red;
|
||||
background-color: #F3F3F3;
|
||||
border-bottom: 4px solid #FFA600;
|
||||
}
|
||||
|
||||
/* Font colors */
|
||||
font.names { color: #EC981F ; }
|
||||
|
||||
/* Company Logo Boxes */
|
||||
.companybox {
|
||||
border-color : #FFFFFF;
|
||||
border : 0px #FFFFFF;
|
||||
border-top : #999999 0pt solid;
|
||||
border-left : #999999 0pt solid;
|
||||
border-right : #999999 0pt solid;
|
||||
border-bottom : #999999 0pt solid;
|
||||
text-align: left;
|
||||
padding: 10px 10px 10px 10px;
|
||||
}
|
||||
|
||||
|
||||
/* Alignment classes */
|
||||
.float-left { float: left;}
|
||||
.float-right { float: right; }
|
||||
.align-left { text-align: left; }
|
||||
.align-right { text-align: right; }
|
||||
.align-center { text-align: center; }
|
||||
.align-justify { text-align: justify; }
|
||||
|
||||
/* display classes */
|
||||
.clear { clear: both; }
|
||||
.block { display: block; }
|
||||
.hide { display: none; }
|
||||
.orange { color: #FFA600; }
|
||||
.tab { padding: 0px 0px 0px 16px; }
|
||||
|
||||
|
||||
BIN
www/images/arrow.gif
Normal file
BIN
www/images/arrow.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 87 B |
BIN
www/images/avago.jpg
Normal file
BIN
www/images/avago.jpg
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 4.6 KiB |
BIN
www/images/clock.gif
Normal file
BIN
www/images/clock.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 272 B |
BIN
www/images/comment.gif
Normal file
BIN
www/images/comment.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 364 B |
BIN
www/images/fig1.png
Normal file
BIN
www/images/fig1.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 61 KiB |
BIN
www/images/fig2.png
Normal file
BIN
www/images/fig2.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 28 KiB |
BIN
www/images/fig3.png
Normal file
BIN
www/images/fig3.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 38 KiB |
BIN
www/images/fig4.png
Normal file
BIN
www/images/fig4.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 42 KiB |
BIN
www/images/footerbg.gif
Normal file
BIN
www/images/footerbg.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 106 B |
BIN
www/images/headerbg-orange.gif
Normal file
BIN
www/images/headerbg-orange.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 503 B |
BIN
www/images/headerbg.gif
Normal file
BIN
www/images/headerbg.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 500 B |
BIN
www/images/init_scst.png
Normal file
BIN
www/images/init_scst.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 35 KiB |
BIN
www/images/iss.jpg
Normal file
BIN
www/images/iss.jpg
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 4.9 KiB |
BIN
www/images/logo.gif
Executable file
BIN
www/images/logo.gif
Executable file
Binary file not shown.
|
After Width: | Height: | Size: 2.4 KiB |
BIN
www/images/menubg.gif
Normal file
BIN
www/images/menubg.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 46 B |
BIN
www/images/menubg_current.gif
Normal file
BIN
www/images/menubg_current.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 46 B |
BIN
www/images/menudivide.gif
Normal file
BIN
www/images/menudivide.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 821 B |
BIN
www/images/page.gif
Normal file
BIN
www/images/page.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 393 B |
BIN
www/images/quote.gif
Normal file
BIN
www/images/quote.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 346 B |
BIN
www/images/scst_cmd_thread.png
Normal file
BIN
www/images/scst_cmd_thread.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 254 KiB |
BIN
www/images/scst_mgmt_cmd_thread.png
Normal file
BIN
www/images/scst_mgmt_cmd_thread.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 45 KiB |
BIN
www/images/scst_mgmt_thread.png
Normal file
BIN
www/images/scst_mgmt_thread.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 303 KiB |
BIN
www/images/square_arrow.gif
Normal file
BIN
www/images/square_arrow.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 488 B |
BIN
www/images/t_emulex.gif
Normal file
BIN
www/images/t_emulex.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 6.2 KiB |
BIN
www/images/t_fcoe.gif
Executable file
BIN
www/images/t_fcoe.gif
Executable file
Binary file not shown.
|
After Width: | Height: | Size: 6.1 KiB |
BIN
www/images/t_lsi.gif
Executable file
BIN
www/images/t_lsi.gif
Executable file
Binary file not shown.
|
After Width: | Height: | Size: 6.3 KiB |
BIN
www/images/t_qlogic.gif
Normal file
BIN
www/images/t_qlogic.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 6.4 KiB |
BIN
www/images/t_rdma.gif
Executable file
BIN
www/images/t_rdma.gif
Executable file
Binary file not shown.
|
After Width: | Height: | Size: 6.4 KiB |
BIN
www/images/t_sas.gif
Normal file
BIN
www/images/t_sas.gif
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 6.1 KiB |
BIN
www/images/t_unsupported.gif
Executable file
BIN
www/images/t_unsupported.gif
Executable file
Binary file not shown.
|
After Width: | Height: | Size: 6.2 KiB |
52
www/images/tooltips.js
Normal file
52
www/images/tooltips.js
Normal file
@@ -0,0 +1,52 @@
|
||||
var d = document;
|
||||
var offsetfromcursorY=15 // y offset of tooltip
|
||||
var ie=d.all && !window.opera;
|
||||
var ns6=d.getElementById && !d.all;
|
||||
var tipobj,op;
|
||||
|
||||
function tooltip(el,txt) {
|
||||
tipobj=d.getElementById('mess');
|
||||
tipobj.innerHTML = txt;
|
||||
op = 0.1;
|
||||
tipobj.style.opacity = op;
|
||||
tipobj.style.display="block";
|
||||
tipobj.style.visibility="visible";
|
||||
|
||||
el.onmousemove=positiontip;
|
||||
appear();
|
||||
}
|
||||
|
||||
function hide_info(el) {
|
||||
d.getElementById('mess').style.visibility='hidden';
|
||||
d.getElementById('mess').style.display='none';
|
||||
el.onmousemove='';
|
||||
}
|
||||
|
||||
function ietruebody(){
|
||||
return (d.compatMode && d.compatMode!="BackCompat")? d.documentElement : d.body
|
||||
}
|
||||
|
||||
function positiontip(e) {
|
||||
var curX=(ns6)?e.pageX : event.clientX+ietruebody().scrollLeft;
|
||||
var curY=(ns6)?e.pageY : event.clientY+ietruebody().scrollTop;
|
||||
var winwidth=ie? ietruebody().clientWidth : window.innerWidth-20
|
||||
var winheight=ie? ietruebody().clientHeight : window.innerHeight-20
|
||||
|
||||
var rightedge=ie? winwidth-event.clientX : winwidth-e.clientX;
|
||||
var bottomedge=ie? winheight-event.clientY-offsetfromcursorY : winheight-e.clientY-offsetfromcursorY;
|
||||
|
||||
if (rightedge < tipobj.offsetWidth) tipobj.style.left=curX-tipobj.offsetWidth+"px";
|
||||
else tipobj.style.left=curX+"px";
|
||||
|
||||
if (bottomedge < tipobj.offsetHeight) tipobj.style.top=curY-tipobj.offsetHeight-offsetfromcursorY+"px"
|
||||
else tipobj.style.top=curY+offsetfromcursorY+"px";
|
||||
}
|
||||
|
||||
function appear() {
|
||||
if(op < 0.9) {
|
||||
op += 0.07;
|
||||
tipobj.style.opacity = op;
|
||||
tipobj.style.filter = 'alpha(opacity='+op*100+')';
|
||||
t = setTimeout('appear()', 30);
|
||||
}
|
||||
}
|
||||
207
www/index.html
Normal file
207
www/index.html
Normal file
@@ -0,0 +1,207 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="Generic SCSI Target Subsystem for Linux, SCST, SCSI target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<meta name="verify-v1" content="N5TwpSXr8cNkQf0gvE3F3sv+TPHL15k4dTo+ZQCeV9Q=">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCST: A Generic SCSI Target Subsystem for Linux</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id="slogan">Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li id="current"><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
<div id="content-wrap">
|
||||
<div id="main">
|
||||
<h1>Generic SCSI Target Subsystem for Linux</h1>
|
||||
|
||||
<p>The generic SCSI target subsystem for Linux (SCST) allows creation of sophisticated storage devices
|
||||
from any Linux box. Those
|
||||
devices can provide advanced
|
||||
functionality, like replication, thin provisioning,
|
||||
deduplication, high availability,
|
||||
automatic backup, etc. Another class of such devices
|
||||
are Virtual Tape Libraries (VTL)
|
||||
as well as other disk-based backup solutions.</p>
|
||||
<p>SCST devices can use any link which supports
|
||||
SCSI-style data exchange: <strong>iSCSI</strong>, <strong>Fibre Channel</strong>, <strong>FCoE</strong>,
|
||||
<strong>SAS</strong>,
|
||||
<strong>InfiniBand (SRP)</strong>, <strong>Wide (parallel) SCSI</strong>, etc.</p>
|
||||
<p>It might
|
||||
well be that your favorite storage appliance is running SCST in the firmware.</p>
|
||||
|
||||
<p>SCST project consists from a set of subprojects: generic SCSI target mid-layer itself (SCST core)
|
||||
with a set of device handlers as well as target drivers
|
||||
and user space utilities.
|
||||
|
||||
<h1>Features of SCST Core</h1>
|
||||
<ul>
|
||||
<li><span>SCST core provides unified,
|
||||
consistent interface between SCSI target drivers and
|
||||
Linux kernel as well as between Linux kernel and storage backend
|
||||
handlers, connecting target drivers with real or emulated storage backend.</span></li>
|
||||
<li><span>SCST core performs all required pre- and post- processing of incoming requests as well as
|
||||
necessary error recovery.</span></li>
|
||||
<li><span>SCST core undertakes most problems, related to execution contexts, thus practically eliminating one of the most
|
||||
complicated problem in the kernel drivers development. For example, target drivers for Marvell
|
||||
SAS adapters or for InfiniBand SRP are less 3000 lines of code long.</span></li>
|
||||
<li><span>Very low overhead and fine-grained locks allow to reach the
|
||||
maximum performance and scalability. Particularly, incoming requests can be processed in
|
||||
the caller's context or in one of the internal SCST core's tasklets without any
|
||||
extra context switches.</span></li>
|
||||
<li><span>Device handlers architecture allows various I/O
|
||||
modes in backstorage handling. For example, pass-through device handlers allow to export real
|
||||
SCSI hardware and vdisk device handler allows to export files as virtual disks.</span></li>
|
||||
<li><span>Advanced per-initiator devices visibility management (LUN masking) allows different
|
||||
initiators to see different set of devices with different access permissions. For instance,
|
||||
initiator A could see exported from target T devices X and Y read-writable, and initiator B from
|
||||
the same target T could see devices Y read-only and Z read-writable.
|
||||
This feature is required for hardware targets, which don't have ability to create
|
||||
virtual targets (SAS adapters, for instance).</span></li>
|
||||
<li><span>SCST core emulates necessary functionality of SCSI host adapter, because from remote initiators' point of view
|
||||
a SCSI target acts as a SCSI host with its own devices. This is especially important in pass-through mode with
|
||||
one to many relationship, i.e. when multiple initiators can connect to the exported pass-through
|
||||
devices. You can find more deep elaboration why it is needed in <a href="http://www.mail-archive.com/linux-scsi@vger.kernel.org/msg06911.html">this</a>
|
||||
message in thread "Question for pass-through target design" in linux-scsi mailing list. Some of the emulated functions are the following:</span>
|
||||
<ul>
|
||||
<li><span>Generation of necessary UNIT ATTENTIONs, their storage and delivery to all connected
|
||||
remote initiators.</span></li>
|
||||
|
||||
<li><span>RESERVE/RELEASE functionality.</span></li>
|
||||
|
||||
<li><span>All types of RESETs and other task management functions.</span></li>
|
||||
|
||||
<li><span>REPORT LUNS command as well as SCSI address space management in order to have consistent
|
||||
address space on all remote initiators, since local SCSI devices could not know about each
|
||||
other to report via REPORT LUNS command. Additionally, SCST core responds with error on all
|
||||
commands to non-existing devices and provides access control, so different remote
|
||||
initiators could see different set of devices.</span></li>
|
||||
|
||||
<li><span>Other necessary functionality (task attributes, etc.) as specified in SCSI standards.</span></li>
|
||||
</ul>
|
||||
</li>
|
||||
|
||||
<li><span>SCST core has multithreaded design and complete SMP support, so, if necessary, all your CPU cores will participate in the commands
|
||||
processing.</span></li>
|
||||
<li><span>Well documented.</span></li>
|
||||
</ul>
|
||||
<p>Interoperability between remote and local SCSI initiators (i.e. sd, st, etc.) is the additional issue that SCST is going to
|
||||
address (it is not implemented yet). It is necessary, because local SCSI initiators can change the state of the
|
||||
device, for example RESERVE the device, or some of its parameters and that could be done behind SCST, i.e. remote initiators
|
||||
will not know about it, which could
|
||||
lead to various problems, including data corruption. Thus, RESERVE/RELEASE commands, locally generated
|
||||
UNIT ATTENTIONs, etc. should be intercepted and passed through SCST core.</p>
|
||||
|
||||
<p>You can find comparison of SCST with other SCSI targets on the <a href="comparison.html">Comparison</a> page.
|
||||
Some highlights what it can mean for end users you can find on the <a href="target_iscsi.html">iSCSI-SCST</a> page.
|
||||
|
||||
<h1>SCST core supports the following I/O modes</h1>
|
||||
<ul>
|
||||
<li><span>Pass-through mode with one to many relationship, i.e. when multiple initiators can
|
||||
connect to the exported pass-through devices, for virtually all SCSI devices types: disks (type 0),
|
||||
tapes (type 1), processors (type 3), CDROMs (type 5), MO disks (type 7), medium changers (type 8) and RAID
|
||||
controllers (type 0xC). In this mode you can, for instance, share your parallel SCSI tape or SATA
|
||||
DVD-RW device to your iSCSI network.</span></li>
|
||||
<li><span>FILEIO mode, which allows to use files on file systems or block devices as virtual
|
||||
remotely available SCSI disks or CDROMs with benefits of the Linux cache.</span></li>
|
||||
<li><span>BLOCKIO mode, which performs direct block IO with a block device, bypassing
|
||||
page-cache for all operations. This mode works well with high-end storage HBAs and for applications that
|
||||
either do not need caching between application and disk or need the large block throughput.</span></li>
|
||||
<li><span>User space mode using scst_user device handler, which allows to implement in the
|
||||
user space high performance virtual SCSI devices. Comparing with fully in-kernel dev handlers
|
||||
this mode has very low overhead (few %%).</span></li>
|
||||
<li><span>Performance testing device handlers as well as NULLIO mode to provide
|
||||
a way for direct performance measurements without overhead of actual data
|
||||
transfers from/to underlying SCSI devices.
|
||||
</span></li>
|
||||
</ul>
|
||||
|
||||
<h1>Certification</h1>
|
||||
|
||||
<p>SCST core engine has passed VMware certification as part of
|
||||
<a href="http://scalecomputing.com/products">Scale’s Intelligent Clustered Storage</a> technology
|
||||
and <a href="http://www.iss-integration.com/supercore.html">ISS STORCIUM</a> solution. It also has passed
|
||||
VMware and Microsoft certification as part of <a href="https://www.sandisk.com/business/datacenter/products/flash-software/ion-accelerator">SanDisk ION Accelerator</a>
|
||||
and storage arrays developed by <a href="http://www.open-e.com/">Open-E, Inc</a>.</p>
|
||||
|
||||
<p>In October 2012 Hewlett-Packard ProLiant BL465c Gen8 witrh SCST-based storage earned the maximum
|
||||
score 59.99@62 tiles in <a href="http://www.vmware.com/a/vmmark">VMmark Version 2.1.1</a>.
|
||||
In June 2016 this result was updated by <a href="http://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/vmmark/2016-06-07-HPE-ProLiant-DL580G9.pdf">HPE ProLiant DL580 Gen9</a></p>
|
||||
</div>
|
||||
<div id="rightbar">
|
||||
<h1>Documentation</h1>
|
||||
<p><a href="scst_pg.html">HTML</a></p>
|
||||
<p><a href="scst_pg.pdf">PDF</a></p>
|
||||
<p><a href="http://events.linuxfoundation.org/sites/events/files/slides/lcna15_bvanassche.pdf">SCST overview slides</a></p>
|
||||
<p><a href="http://monklinux.blogspot.com/2012/02/scst-configuration-how-to-using-gentoo.html">Gentoo HOWTO</a></p>
|
||||
<p><a href="iscsi-scst-howto.txt">HOWTO For iSCSI-SCST</a></p>
|
||||
<p><a href="SCST_Gentoo_HOWTO.txt">Gentoo HOWTO For iSCSI-SCST</a></p>
|
||||
<p><a href="qla2x00t-howto.html">HOWTO For QLogic Target Driver</a></p>
|
||||
<p><a href="sgv_cache.html">SCST SGV Cache Description</a></p>
|
||||
<p><a href="http://scst.sourceforge.net/scst_user_spec.pdf">SCST user space device handler interface description</a></p>
|
||||
<h1>Articles</h1>
|
||||
<p>By Marc Smith:</p>
|
||||
<p><a href="http://marcitland.blogspot.com/2011/03/accelerating-vdi-using-scst-and-ssds.html">Accelerating VDI Using SCST and SSDs</a></p>
|
||||
<p><a href="http://marcitland.blogspot.com/2013/04/building-using-highly-available-esos.html">Building & Using a Highly Available ESOS Disk Array</a></p>
|
||||
<p><a href="http://marcitland.blogspot.com/2014/07/open-storage-dual-controller-oss-disk.html">Open Storage: Dual-Controller OSS Disk Array</a></p>
|
||||
<h1>SCST 0.9.6 graphs</h1>
|
||||
<p><a href="images/init_scst.png">init_scst</a></p>
|
||||
<p><a href="images/scst_cmd_thread.png">scst_cmd_thread</a></p>
|
||||
<p><a href="images/scst_mgmt_cmd_thread.png">scst_mgmt_cmd_thread</a></p>
|
||||
<p><a href="images/scst_mgmt_thread.png">scst_mgmt_thread</a></p>
|
||||
<p>all by Ming Zhang</p>
|
||||
<h1>QUESTIONS</h1>
|
||||
<p>If you have any questions you can ask them via<br><a href="http://lists.sourceforge.net/lists/listinfo/scst-devel">
|
||||
scst-devel mailing list</a><br><br>
|
||||
See <a href="http://sourceforge.net/mail/?group_id=110471">mailing lists page</a> for more info about SCST mailing
|
||||
lists.</p>
|
||||
<h1></h1>
|
||||
<p><a href="http://sourceforge.net/donate/index.php?group_id=110471">
|
||||
<img src="http://images.sourceforge.net/images/project-support.jpg" width="88" height="32" border="0" alt="Support This Project"> </a></p>
|
||||
<h1></h1>
|
||||
<p><a href="http://validator.w3.org/check?uri=referer">
|
||||
<img src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a>
|
||||
</p>
|
||||
<p><a href="http://jigsaw.w3.org/css-validator/check/referer">
|
||||
<img style="border:0;width:88px;height:31px" src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!"></a>
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
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|
||||
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|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
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document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
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</script><script type="text/javascript">
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|
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piwik_log(piwik_action_name, piwik_idsite, piwik_url);
|
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|
||||
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|
||||
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|
||||
</body>
|
||||
</html>
|
||||
21
www/iscsi-scst/index.html
Normal file
21
www/iscsi-scst/index.html
Normal file
@@ -0,0 +1,21 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<object><noscript>
|
||||
<meta http-equiv="Refresh" content="0; URL=http://scst.sourceforge.net/target_iscsi.html">
|
||||
</noscript></object>
|
||||
<title>Old iSCSI-SCST page</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<script language="JavaScript1.1" type="text/javascript">
|
||||
<!--
|
||||
location.replace("http://scst.sourceforge.net/target_iscsi.html");
|
||||
//-->
|
||||
</script>
|
||||
</body>
|
||||
|
||||
</html>
|
||||
|
||||
61
www/max_outstanding_r2t.txt
Normal file
61
www/max_outstanding_r2t.txt
Normal file
@@ -0,0 +1,61 @@
|
||||
MaxOutstandingR2T iSCSI parameter and its
|
||||
influence on performance in case of high
|
||||
latency links.
|
||||
|
||||
|
||||
Let's consider we have a 1Gbps network between initiator and target with
|
||||
10ms latency (a good near distance WAN/Internet to another building in
|
||||
the same town). We want to send backup from the initiator to a tape or
|
||||
tape library on the target. We are limited to send only 1 write command
|
||||
at time, because our tape doesn't allow more. We will send 2MB of data
|
||||
in each command.
|
||||
|
||||
Our initiator and target negotiated typical values InitialR2T No,
|
||||
ImmediateData Yes, FirstBurstLength 65536, MaxBurstLength 262144. Other
|
||||
parameters don't matter for our task, except MaxOutstandingR2T. Let we
|
||||
can run 2 pieces of iSCSI target software on the target: one supporting
|
||||
only MaxOutstandingR2T 1 and another one supporting MaxOutstandingR2T >1.
|
||||
The first target negotiated MaxOutstandingR2T 1, the second one - 16.
|
||||
|
||||
10ms means that a 1 byte packet send from the initiator reaches the
|
||||
target in 5ms time. Then 5ms in the opposite direction. 1Gbps bandwidth
|
||||
means that 64K of data transferred from the initiator to the target in
|
||||
about 0.5ms. The maximum throuput we can have with 1Gbps link is about
|
||||
120MB/s.
|
||||
|
||||
For sake of simplification we will suppose the targets will process
|
||||
requests and the initiator will process responses quick enough, so we
|
||||
can ignore additional latency the processing on both sides adds.
|
||||
|
||||
Since each R2T request must contain less than MaxBurstLength data, we
|
||||
need ((2MB - 64K)/256K) = 8 R2T requests to send. The first 64K will be
|
||||
sent as immediate/unsolicited data without explicit R2T request.
|
||||
|
||||
|
||||
1. The first target with MaxOutstandingR2T 1.
|
||||
|
||||
MaxOutstandingR2T 1 means that only one R2T request can be active on
|
||||
time. I.e., the next request for data transfer can be sent after the
|
||||
previous one completed and all the data received.
|
||||
|
||||
Thus, on the first target each command will be completed on time:
|
||||
|
||||
5 + 0.5 + (5 + 5 + 256K/64K * 0.5) * 7 + (5 + 5 + (256K - 64K)/64K *
|
||||
0.5) + 5 = 106ms, i.e. 9 IOPS, which is 18MB/s. Remember, we have
|
||||
120MB/s link.
|
||||
|
||||
|
||||
2. The second target with MaxOutstandingR2T 16.
|
||||
|
||||
With MaxOutstandingR2T 16 the second target can send all R2T requests at
|
||||
once and the first R2T can be sent before immediate/unsolicited data
|
||||
received.
|
||||
|
||||
Thus, on the second target each command will be completed on time:
|
||||
|
||||
5 + 5 + 5 + 256K/64K * 0.5 * 7 + (256K-64K)/64K * 0.5 + 5 = 35.5ms,
|
||||
i.e. 28 IOPS, which is 56MB/s.
|
||||
|
||||
|
||||
Thus, the second target with MaxOutstandingR2T 16 will perform on 56/18 = 311%
|
||||
better that the first target with MaxOutstandingR2T 1.
|
||||
266
www/mc_s.html
Normal file
266
www/mc_s.html
Normal file
@@ -0,0 +1,266 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="MC/S, MC/S vs MPIO, multiple connections per session">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>MC/S vs MPIO</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li id="current"><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Comparison</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="comparison.html">Features comparison</a></li>
|
||||
<li><a href="scstvslio.html">SCST vs LIO/TCM</a></li>
|
||||
<li><a href="scstvsstgt.html">SCST vs STGT</a></li>
|
||||
<li><a href="mc_s.html">MC/S vs MPIO</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
|
||||
<h1>MC/S vs MPIO</h1>
|
||||
|
||||
<p>MC/S (Multiple Connections per Session) is a feature of iSCSI
|
||||
protocol, which allows to combine several connections inside a single
|
||||
session for performance and failover purposes. Let's consider what
|
||||
practical value this feature has comparing with OS level multipath
|
||||
(MPIO) and try to answer why none of Open Source OS'es neither still
|
||||
support it, despite of many years since iSCSI protocol started
|
||||
being actively used, nor going to implement it in the future.</p>
|
||||
|
||||
<p>MC/S is done on the iSCSI level, while MPIO is done on the higher
|
||||
level. Hence, all MPIO infrastructure is shared among all SCSI
|
||||
transports, including Fibre Channel, SAS, etc. </p>
|
||||
|
||||
<p>MC/S was designed at time, when most OS'es didn't have standard OS level
|
||||
multipath. Instead, each vendor had its own implementation, which
|
||||
created huge interoperability problems. So, one of the goals of MC/S was
|
||||
to address this issue and standardize the multipath area in a single standard. But
|
||||
nowadays almost all OS'es has OS level multipath implemented using
|
||||
standard SCSI facilities, hence this purpose of MC/S isn't valid anymore.</p>
|
||||
|
||||
<p>Usually it is claimed, than MC/S has the following 2 advantages over MPIO:</p>
|
||||
|
||||
<ol>
|
||||
<li><span>Faster failover recovery.</span></li>
|
||||
|
||||
<li><span>Better performance.</span></li>
|
||||
|
||||
</ol>
|
||||
|
||||
<p>Let's look how realistic those claims are.</p>
|
||||
|
||||
<h2>Failover recovery time</h2>
|
||||
|
||||
<p>Let's consider a single target exporting a single device over 2 links.</p>
|
||||
|
||||
<p>For MC/S failover recovery is quite simple: all outstanding SCSI
|
||||
commands reassigned to another connection. No other actions are
|
||||
necessary, because session (i.e. I_T Nexus) remains the same.
|
||||
Consequently, all reservations and other SCSI states as well as other
|
||||
initiators connected to the device remain unaffected.</p>
|
||||
|
||||
<p>For MPIO failover recovery is much more complicated. This is because
|
||||
it involves transfer of all outstanding commands and SCSI states from one
|
||||
I_T Nexus to another. The first thing, which initiator will do for
|
||||
that is to abort all outstanding commands on the faulted
|
||||
I_T Nexus. There are 2 approaches for that: CLEAR TASK SET and LUN RESET
|
||||
task management functions. </p>
|
||||
|
||||
<p>CLEAR TASK SET function aborts all commands on the device.
|
||||
Unfortunately, it has limitations: it isn't always supported by device
|
||||
and having single task set shared over initiators isn't always
|
||||
appropriate for application.</p>
|
||||
|
||||
<p>LUN RESET function resets the device.</p>
|
||||
|
||||
<p>Both CLEAR TASK SET and LUN RESET functions can somehow harm
|
||||
other initiators, because all commands from all initiators, not only
|
||||
from one doing the failover recovery, will be aborted. Additionally, LUN
|
||||
RESET resets all SCSI settings for all connected initiators to the
|
||||
initial state and, if device had reservation from any initiator, it will
|
||||
be cleared.
|
||||
|
||||
<p>But the harm is minimal:</p>
|
||||
|
||||
<ul>
|
||||
<li><span> With TAS bit set on Control Mode page, all the aborted commands will
|
||||
be returned to all affected initiators with TASK ABORTED status, so they
|
||||
can simply immediately retry them. For CLEAR TASK SET if TAS isn't set
|
||||
all affected initiators will be notified by Unit Attention COMMANDS
|
||||
CLEARED BY ANOTHER INITIATOR, so they also can immediately retry all
|
||||
outstanding commands.</span></li>
|
||||
|
||||
<li><span>In case of the device reset the affected initiators will be notified via
|
||||
the corresponding Unit Attention about reset of
|
||||
all SCSI settings to the initial state. Then the initiators can do necessary
|
||||
recovery actions. Usually no recovery actions are needed, except for the
|
||||
reservation holder, whose reservation was cleared. For it recovery might
|
||||
be not trivial. But Persistent Reservations solve this issue, because
|
||||
they are not cleared by the device reset.</span></li>
|
||||
</ul>
|
||||
|
||||
<p>Thus, with Persistent Reservations or using CLEAR TASK SET function
|
||||
additional failover recovery time, which MPIO has comparing to MC/S,
|
||||
is time to wait for reset or commands abort finished and time to
|
||||
retry all the aborted commands. On a properly configured system it
|
||||
should be less than few seconds, which is well acceptable on practice.
|
||||
If Linux storage stack improved to allow to abort all submitted to it
|
||||
commands (currently only wait for their completion is possible), then
|
||||
time to abort all the commands can be decreased to a fraction of second. </p>
|
||||
|
||||
<h2>Performance</h2>
|
||||
|
||||
<p>At first, neither MC/S, nor MPIO can improve performance if there is
|
||||
only one SCSI command sent to target at time. For instance, in case of
|
||||
tape backup and restore. Both MC/S and MPIO work on the commands level,
|
||||
so can't split data transfers for a single command over several links.
|
||||
Only bonding (also known as NIC teaming or Link Aggregation) can improve
|
||||
performance in this case, because it works on the link level.</p>
|
||||
|
||||
<p>MC/S over several links preserves commands execution order, i.e. with
|
||||
it commands executed in the same order as they were submitted. MPIO
|
||||
can't preserve this order, because it can't see, which command on which
|
||||
link was submitted earlier. Delays in links processing can change
|
||||
commands order in the place where target receives them.</p>
|
||||
|
||||
<p>Since initiators usually send commands in the optimal for performance
|
||||
order, reordering can somehow hurt performance. But this can happen only with
|
||||
naive target implementation, which can't recover the optimal commands execution
|
||||
order. Currently Linux is not naive and quite good on this area. See, for
|
||||
instance, section "SEQUENTIAL ACCESS OVER MPIO" in <a
|
||||
href="vl_res.txt">those measurements</a>. Don't look at the absolute
|
||||
numbers, look at %% of performance improvement using the second link.
|
||||
The result equivalent to 200 MB/s over 2 1Gbps links, which is close to
|
||||
possible maximum.</p>
|
||||
|
||||
<p>If free commands reorder is forbidden for a device, either
|
||||
by use of ORDERED tag, or if the Queue Algorithm Modifier in the Control
|
||||
Mode Page is set to 0, then MPIO will have to maintain commands order by
|
||||
sending commands over only a single link. But on practice this case is
|
||||
really rare and 99.(9)% of OS'es and applications allow free commands
|
||||
reorder and it is enabled by default.</p>
|
||||
|
||||
<p>From other side, strictly preserving commands order as MC/S does has a
|
||||
downside as well. It can lead to so called "commands ordering
|
||||
bottleneck", when newer commands have to wait before one or more older
|
||||
commands get executed, although it would be better for performance to
|
||||
reorder them. As result, MPIO sometimes has better performance, than
|
||||
MC/S, especially in setups, where maximum IOPS number is important. See,
|
||||
for instance,
|
||||
<a href="http://article.gmane.org/gmane.linux.scsi/16311">here</a>.
|
||||
</p>
|
||||
|
||||
<h2>When MC/S is better than MPIO</h2>
|
||||
|
||||
<p>For sake of completeness, we should mention that there are marginal cases, where MPIO can't be used or will not
|
||||
provide any benefit, but MC/S can be successful:</p>
|
||||
|
||||
<ol>
|
||||
<li><span>When strict commands order is required.</span></li>
|
||||
|
||||
<li><span>When aborted commands can't be retried.</span></li>
|
||||
|
||||
</ol>
|
||||
|
||||
<p>For disks both of them are always false. However for some tape drives
|
||||
and backup applications one or both can be true. But on practice:</p>
|
||||
|
||||
<ul>
|
||||
|
||||
<li><span>There are neither known tape drives, nor backup
|
||||
applications, which can use multiple outstanding commands at
|
||||
time. All them support and use only one single outstanding
|
||||
command at time. MC/S can't increase performance for them, only
|
||||
bonding can. So, in this case there no difference between MC/S
|
||||
and MPIO.</span></li>
|
||||
|
||||
<li><span>The lack of ability to retry commands is rather a
|
||||
limitation of legacy tape drives, which support only implicit
|
||||
address commands, not of MPIO. Modern tape drives and backup
|
||||
applications can use explicit address commands, which you can
|
||||
abort and then retry, hence they are compatible with MPIO.</span></li>
|
||||
|
||||
</ul>
|
||||
|
||||
<h2>Conclusion</h2>
|
||||
|
||||
<p>Thus:</p>
|
||||
|
||||
<ol>
|
||||
<li><span>Cost to develop MC/S is high, but benefits of it are marginal and with future MPIO
|
||||
improvements can be fully eliminated.</span></li>
|
||||
|
||||
<li><span>MPIO allows to utilize existing infrastructure for all
|
||||
transports, not only iSCSI.
|
||||
</span></li>
|
||||
|
||||
<li><span>All transports can benefit from improvements in MPIO.</span></li>
|
||||
|
||||
<li><span>With MPIO there is no need to create multiple layers doing very similar
|
||||
functionality.</span></li>
|
||||
|
||||
<li><span> MPIO doesn't have commands ordering bottleneck, which MC/S has. </span></li>
|
||||
|
||||
</ol>
|
||||
|
||||
<p>Simply, MC/S is rather a workaround done on the wrong level for some deficiencies of existing SCSI standards used for MPIO,
|
||||
namely the lack of possibility to group several I_T Nexuses with ability to reassign commands
|
||||
between them and preserve commands order among them. If in future those features added in the SCSI standards, MC/S will
|
||||
not be needed at all, hence, all investments in it will be voided. No surprise then that no
|
||||
Open Source OS'es neither support, nor going to implement it. Moreover,
|
||||
when back to 2005 there was an attempt to add MC/S capable iSCSI initiator in Linux, it was
|
||||
rejected. See for more details <a href="http://article.gmane.org/gmane.linux.scsi/15769">here</a>
|
||||
and <a href="http://article.gmane.org/gmane.linux.scsi/16301">here</a>.
|
||||
</p>
|
||||
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- wrap ends here -->
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018 <b><font color="#EC981F">Vladislav Bolkhovitin & others</font></b>
|
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Design by: <b><font color="#EC981F">Daniel Fernandes</font></b> </p>
|
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</div>
|
||||
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|
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<script type="text/javascript">
|
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var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
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|
||||
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|
||||
95
www/scst_admin.html
Normal file
95
www/scst_admin.html
Normal file
@@ -0,0 +1,95 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="scst admin">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCST Admin Utility</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>SCST administration utility</h1>
|
||||
|
||||
<p>SCST administration utility scstadmin developed by Mark Buechler.</p>
|
||||
|
||||
<p>With it you can manually or automatically using either plain text config file, or MySQL database configure every aspect of SCST.</p>
|
||||
|
||||
<p>Especially useful feature of scstadmin is ability to figure out and apply <strong>on the fly</strong> on the currently
|
||||
running system changes in scst.conf file. In other words, you can have SCST subsystem running with configuration from file
|
||||
scst.conf, then you edit this file, e.g. add new devices, then scstadmin will figure out that you added those devices
|
||||
and add them to SCST.</p>
|
||||
|
||||
<p class="post-footer align-right">
|
||||
<a href="downloads.html" class="readmore">Download</a>
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
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<!-- Piwik -->
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<script type="text/javascript">
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var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
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document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
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</script><script type="text/javascript">
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piwik_idsite = 1;
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piwik_log(piwik_action_name, piwik_idsite, piwik_url);
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</script>
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<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
<!-- End Piwik Tag -->
|
||||
</body>
|
||||
</html>
|
||||
119
www/scstvslio.html
Normal file
119
www/scstvslio.html
Normal file
@@ -0,0 +1,119 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCST vs LIO/TCM</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li id="current"><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Comparison</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="comparison.html">Features comparison</a></li>
|
||||
<li><a href="scstvslio.html">SCST vs LIO/TCM</a></li>
|
||||
<li><a href="scstvsstgt.html">SCST vs STGT</a></li>
|
||||
<li><a href="mc_s.html">MC/S vs MPIO</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>SCST vs LIO/TCM</h1>
|
||||
<p><a href="http://linux-iscsi.org/" rel="nofollow">LIO</a>,
|
||||
from recently being renamed to TCM, is another independent from SCST implementation
|
||||
of SCSI target framework for Linux. It's started as PyX iSCSI target and then was
|
||||
accommodated to other transports. But it's still in many kinds iSCSI-oriented.
|
||||
You can find an example when people are not happy with it
|
||||
<a href="http://thread.gmane.org/gmane.linux.scsi/65703/focus=66749">here</a>.</p>
|
||||
|
||||
<p>LIO maintainer, Nicholas Bellinger, is very good in building personal relationships and promoting LIO,
|
||||
although often using misleading half, less-then-half and simply deceitful statements
|
||||
about LIO current state, capabilities and future directions as well as about its competitor, SCST.
|
||||
For instance, he setup LIO targets comparison page with obviously wrong statements about SCST, like
|
||||
that it isn't fully zero copy or it isn't a generic target engine (while LIO, of course, is fully
|
||||
zero-copy and fully generic target engine). Any
|
||||
<a href="http://sourceforge.net/mailarchive/message.php?msg_id=21741080">attempts</a>
|
||||
to correct it were simply ignored.</p>
|
||||
|
||||
<p>With those tricks Nicholas Bellinger was capable to attract key Linux kernel developers, and
|
||||
they suddenly changed their opinion about Linux SCSI target subsystem in the opposite direction.
|
||||
They previously asserted that
|
||||
in-kernel SCSI target is the wrong direction, SCSI target must be in the user space, so
|
||||
STGT is what everybody needed. Now their opinion is that SCSI target driver should be in the kernel space
|
||||
and the only target good for them is LIO, doesn't matter that:</p>
|
||||
|
||||
<ol>
|
||||
<li><span>SCST is a lot more mature and advanced</span></li>
|
||||
|
||||
<li><span>SCST from the beginning is a generic SCSI target</span></li>
|
||||
|
||||
<li><span>SCST has a lot more features</span></li>
|
||||
|
||||
<li><span>SCST has better performance</span></li>
|
||||
|
||||
<li><span>SCST has a lot more users</span></li>
|
||||
|
||||
<li><span>SCST has much bigger community</span></li>
|
||||
|
||||
</ol>
|
||||
|
||||
<p>So, rejecting base principles of the Linux kernel community that the best code should win, the worst
|
||||
code was chosen.</p>
|
||||
|
||||
<p>You can find more background behind choosing LIO as the mainline kernel SCSI target
|
||||
subsystem if you read <a href="http://thread.gmane.org/gmane.linux.kernel/1078109/focus=1078310">this thread</a>
|
||||
as well as searching for targets related topics in Linux kernel and Linux SCSI mailing lists.</p>
|
||||
|
||||
<p>Particularly notable is that James Bottomley from the beginning was telling that SCST
|
||||
can't be merged in the mainline kernel, because it doesn't offer a drop in replacement for STGT
|
||||
to avoid having 2 target infrastructures in the kernel at the same time. But, since LIO can't
|
||||
offer user space backend drivers and doesn't have ibmvstgt driver analog, for LIO the drop in replacement wasn't
|
||||
a requirement, so 2.6.38+ kernels successfully have both STGT and LIO.</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- wrap ends here -->
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018 <b><font color="#EC981F">Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font color="#EC981F">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
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piwik_idsite = 1;
|
||||
piwik_url = pkBaseURL + "piwik.php";
|
||||
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|
||||
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|
||||
<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
<!-- End Piwik Tag -->
|
||||
</body>
|
||||
</html>
|
||||
99
www/scstvsstgt.html
Normal file
99
www/scstvsstgt.html
Normal file
@@ -0,0 +1,99 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCST vs STGT">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCST vs STGT</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li id="current"><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Comparison</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="comparison.html">Features comparison</a></li>
|
||||
<li><a href="scstvslio.html">SCST vs LIO/TCM</a></li>
|
||||
<li><a href="scstvsstgt.html">SCST vs STGT</a></li>
|
||||
<li><a href="mc_s.html">MC/S vs MPIO</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>SCST vs STGT</h1>
|
||||
<p><a href="http://stgt.sourceforge.net/">STGT</a> is alternative, independent from SCST implementation
|
||||
of SCSI target framework for Linux. It has different architecture, where SCSI target state machine is placed in
|
||||
the user space, while in SCST all the processing done in the kernel. Such architecture as STGT has was acknowledged
|
||||
by the Linux SCSI subsystem maintainers as a "right" one, so kernel's part of STGT quickly
|
||||
found its way to the kernel.</p>
|
||||
|
||||
<p>But such architecture has several inherent problems. Among them performance and complexity.
|
||||
See <a href="http://lkml.org/lkml/2008/12/10/245">description</a> for the set of patches, submitted for
|
||||
the first iteration of in-kernel inclusion review and comments in Linux kernel mailing list.</p>
|
||||
|
||||
<p>See also the following important discussions:</p>
|
||||
<ul>
|
||||
|
||||
<li><span><a href="http://news.gmane.org/find-root.php?message_id=%3ce2e108260801170127w2937b2afg9bef324efa945e43%40mail.gmail.com%3e">
|
||||
"Performance of SCST versus STGT"</a> for performance comparison.</span></li>
|
||||
|
||||
<li><span><a href="http://news.gmane.org/find-root.php?message_id=%3c463F36AC.3010207%40vlnb.net%3e">
|
||||
"Question for pass-through target design"</a></span></li>
|
||||
|
||||
<li><span><a href="http://news.gmane.org/find-root.php?message_id=%3c43987F75.2000301%40vlnb.net%3e">
|
||||
"Stgt a new version of iscsi target?"</a>, especially pay attention to
|
||||
<a href="http://article.gmane.org/gmane.linux.scsi/21073">this</a> message why STGT's architecture was considered "right".
|
||||
</span></li>
|
||||
|
||||
</ul>
|
||||
|
||||
<p>Time has proved that STGT is too weak to satisfy modern storage requirements. Now it is obsolete and
|
||||
soon going to be removed from the mainline kernel.</p>
|
||||
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- wrap ends here -->
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018 <b><font color="#EC981F">Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font color="#EC981F">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
piwik_action_name = '';
|
||||
piwik_idsite = 1;
|
||||
piwik_url = pkBaseURL + "piwik.php";
|
||||
piwik_log(piwik_action_name, piwik_idsite, piwik_url);
|
||||
</script>
|
||||
<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
<!-- End Piwik Tag -->
|
||||
</body>
|
||||
</html>
|
||||
596
www/sgv_big_order_alloc-sfw5-rc3.diff
Normal file
596
www/sgv_big_order_alloc-sfw5-rc3.diff
Normal file
@@ -0,0 +1,596 @@
|
||||
Index: scst/include/scst_sgv.h
|
||||
===================================================================
|
||||
--- scst/include/scst_sgv.h (revision 3134)
|
||||
+++ scst/include/scst_sgv.h (working copy)
|
||||
@@ -82,12 +82,14 @@ void sgv_pool_put(struct sgv_pool *pool)
|
||||
void sgv_pool_flush(struct sgv_pool *pool);
|
||||
|
||||
void sgv_pool_set_allocator(struct sgv_pool *pool,
|
||||
- struct page *(*alloc_pages_fn)(struct scatterlist *, gfp_t, void *),
|
||||
- void (*free_pages_fn)(struct scatterlist *, int, void *));
|
||||
+ struct page *(*alloc_pages_fn)(struct scatterlist *,
|
||||
+ gfp_t, int, void *),
|
||||
+ void (*free_pages_fn)(struct scatterlist *, int, int, void *));
|
||||
|
||||
struct scatterlist *sgv_pool_alloc(struct sgv_pool *pool, unsigned int size,
|
||||
gfp_t gfp_mask, int flags, int *count,
|
||||
- struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv);
|
||||
+ struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv,
|
||||
+ int max_sg_count);
|
||||
void sgv_pool_free(struct sgv_pool_obj *sgv, struct scst_mem_lim *mem_lim);
|
||||
|
||||
void *sgv_get_priv(struct sgv_pool_obj *sgv);
|
||||
Index: scst/src/scst_mem.h
|
||||
===================================================================
|
||||
--- scst/src/scst_mem.h (revision 3134)
|
||||
+++ scst/src/scst_mem.h (working copy)
|
||||
@@ -37,6 +37,8 @@ struct sgv_pool_obj {
|
||||
int cache_num;
|
||||
int pages;
|
||||
|
||||
+ int alloc_order;
|
||||
+
|
||||
/* jiffies, protected by sgv_pool_lock */
|
||||
unsigned long time_stamp;
|
||||
|
||||
@@ -66,9 +68,9 @@ struct sgv_pool_cache_acc {
|
||||
*/
|
||||
struct sgv_pool_alloc_fns {
|
||||
struct page *(*alloc_pages_fn)(struct scatterlist *sg, gfp_t gfp_mask,
|
||||
- void *priv);
|
||||
+ int alloc_order, void *priv);
|
||||
void (*free_pages_fn)(struct scatterlist *sg, int sg_count,
|
||||
- void *priv);
|
||||
+ int alloc_order, void *priv);
|
||||
};
|
||||
|
||||
/*
|
||||
Index: scst/src/scst_lib.c
|
||||
===================================================================
|
||||
--- scst/src/scst_lib.c (revision 3134)
|
||||
+++ scst/src/scst_lib.c (working copy)
|
||||
@@ -4454,7 +4454,6 @@ int scst_alloc_space(struct scst_cmd *cm
|
||||
int atomic = scst_cmd_atomic(cmd);
|
||||
int flags;
|
||||
struct scst_tgt_dev *tgt_dev = cmd->tgt_dev;
|
||||
- static int ll;
|
||||
|
||||
TRACE_ENTRY();
|
||||
|
||||
@@ -4465,40 +4464,23 @@ int scst_alloc_space(struct scst_cmd *cm
|
||||
flags |= SGV_POOL_ALLOC_NO_CACHED;
|
||||
|
||||
cmd->sg = sgv_pool_alloc(tgt_dev->pool, cmd->bufflen, gfp_mask, flags,
|
||||
- &cmd->sg_cnt, &cmd->sgv, &cmd->dev->dev_mem_lim, NULL);
|
||||
+ &cmd->sg_cnt, &cmd->sgv, &cmd->dev->dev_mem_lim, NULL,
|
||||
+ tgt_dev->max_sg_cnt);
|
||||
if (cmd->sg == NULL)
|
||||
goto out;
|
||||
|
||||
- if (unlikely(cmd->sg_cnt > tgt_dev->max_sg_cnt)) {
|
||||
- if ((ll < 10) || TRACING_MINOR()) {
|
||||
- PRINT_INFO("Unable to complete command due to "
|
||||
- "SG IO count limitation (requested %d, "
|
||||
- "available %d, tgt lim %d)", cmd->sg_cnt,
|
||||
- tgt_dev->max_sg_cnt, cmd->tgt->sg_tablesize);
|
||||
- ll++;
|
||||
- }
|
||||
- goto out_sg_free;
|
||||
- }
|
||||
+ EXTRACHECKS_BUG_ON(cmd->sg_cnt > tgt_dev->max_sg_cnt);
|
||||
|
||||
if (cmd->data_direction != SCST_DATA_BIDI)
|
||||
goto success;
|
||||
|
||||
cmd->out_sg = sgv_pool_alloc(tgt_dev->pool, cmd->out_bufflen, gfp_mask,
|
||||
flags, &cmd->out_sg_cnt, &cmd->out_sgv,
|
||||
- &cmd->dev->dev_mem_lim, NULL);
|
||||
+ &cmd->dev->dev_mem_lim, NULL, tgt_dev->max_sg_cnt);
|
||||
if (cmd->out_sg == NULL)
|
||||
goto out_sg_free;
|
||||
|
||||
- if (unlikely(cmd->out_sg_cnt > tgt_dev->max_sg_cnt)) {
|
||||
- if ((ll < 10) || TRACING_MINOR()) {
|
||||
- PRINT_INFO("Unable to complete command due to "
|
||||
- "SG IO count limitation (OUT buffer, requested "
|
||||
- "%d, available %d, tgt lim %d)", cmd->out_sg_cnt,
|
||||
- tgt_dev->max_sg_cnt, cmd->tgt->sg_tablesize);
|
||||
- ll++;
|
||||
- }
|
||||
- goto out_out_sg_free;
|
||||
- }
|
||||
+ EXTRACHECKS_BUG_ON(cmd->out_sg_cnt > tgt_dev->max_sg_cnt);
|
||||
|
||||
success:
|
||||
res = 0;
|
||||
@@ -4507,12 +4489,6 @@ out:
|
||||
TRACE_EXIT();
|
||||
return res;
|
||||
|
||||
-out_out_sg_free:
|
||||
- sgv_pool_free(cmd->out_sgv, &cmd->dev->dev_mem_lim);
|
||||
- cmd->out_sgv = NULL;
|
||||
- cmd->out_sg = NULL;
|
||||
- cmd->out_sg_cnt = 0;
|
||||
-
|
||||
out_sg_free:
|
||||
sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim);
|
||||
cmd->sgv = NULL;
|
||||
Index: scst/src/scst_mem.c
|
||||
===================================================================
|
||||
--- scst/src/scst_mem.c (revision 3134)
|
||||
+++ scst/src/scst_mem.c (working copy)
|
||||
@@ -110,8 +110,8 @@ static void sgv_dtor_and_free(struct sgv
|
||||
TRACE_MEM("Destroying sgv obj %p", obj);
|
||||
|
||||
if (obj->sg_count != 0) {
|
||||
- pool->alloc_fns.free_pages_fn(obj->sg_entries,
|
||||
- obj->sg_count, obj->allocator_priv);
|
||||
+ pool->alloc_fns.free_pages_fn(obj->sg_entries, obj->sg_count,
|
||||
+ obj->alloc_order, obj->allocator_priv);
|
||||
}
|
||||
if (obj->sg_entries != obj->sg_entries_data) {
|
||||
if (obj->trans_tbl !=
|
||||
@@ -522,11 +522,13 @@ out:
|
||||
}
|
||||
|
||||
static void sgv_free_sys_sg_entries(struct scatterlist *sg, int sg_count,
|
||||
- void *priv)
|
||||
+ int alloc_order, void *priv)
|
||||
{
|
||||
int i;
|
||||
+ const int num_pages = 1 << alloc_order;
|
||||
|
||||
- TRACE_MEM("sg=%p, sg_count=%d", sg, sg_count);
|
||||
+ TRACE_MEM("sg=%p, sg_count=%d, alloc_order=%d",
|
||||
+ sg, sg_count, alloc_order);
|
||||
|
||||
for (i = 0; i < sg_count; i++) {
|
||||
struct page *p = sg_page(&sg[i]);
|
||||
@@ -538,36 +540,23 @@ static void sgv_free_sys_sg_entries(stru
|
||||
(unsigned long)p, len, pages);
|
||||
|
||||
while (pages > 0) {
|
||||
- int order = 0;
|
||||
-
|
||||
-/*
|
||||
- * __free_pages() doesn't like freeing pages with not that order with
|
||||
- * which they were allocated, so disable this small optimization.
|
||||
- */
|
||||
-#if 0
|
||||
- if (len > 0) {
|
||||
- while (((1 << order) << PAGE_SHIFT) < len)
|
||||
- order++;
|
||||
- len = 0;
|
||||
- }
|
||||
-#endif
|
||||
TRACE_MEM("free_pages(): order %d, page %lx",
|
||||
- order, (unsigned long)p);
|
||||
+ alloc_order, (unsigned long)p);
|
||||
|
||||
- __free_pages(p, order);
|
||||
+ __free_pages(p, alloc_order);
|
||||
|
||||
- pages -= 1 << order;
|
||||
- p += 1 << order;
|
||||
+ pages -= num_pages;
|
||||
+ p += num_pages;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
-static struct page *sgv_alloc_sys_pages(struct scatterlist *sg,
|
||||
- gfp_t gfp_mask, void *priv)
|
||||
+static struct page *sgv_alloc_sys_pages(struct scatterlist *sg, gfp_t gfp_mask,
|
||||
+ int alloc_order, void *priv)
|
||||
{
|
||||
- struct page *page = alloc_pages(gfp_mask, 0);
|
||||
+ struct page *page = alloc_pages(gfp_mask, alloc_order);
|
||||
|
||||
- sg_set_page(sg, page, PAGE_SIZE, 0);
|
||||
+ sg_set_page(sg, page, PAGE_SIZE << alloc_order, 0);
|
||||
TRACE_MEM("page=%p, sg=%p, priv=%p", page, sg, priv);
|
||||
if (page == NULL) {
|
||||
TRACE(TRACE_OUT_OF_MEM, "%s", "Allocation of "
|
||||
@@ -579,7 +568,7 @@ static struct page *sgv_alloc_sys_pages(
|
||||
static int sgv_alloc_sg_entries(struct scatterlist *sg, int pages,
|
||||
gfp_t gfp_mask, enum sgv_clustering_types clustering_type,
|
||||
struct trans_tbl_ent *trans_tbl,
|
||||
- const struct sgv_pool_alloc_fns *alloc_fns, void *priv)
|
||||
+ const struct sgv_pool_alloc_fns *alloc_fns, int alloc_order, void *priv)
|
||||
{
|
||||
int sg_count = 0;
|
||||
int pg, i, j;
|
||||
@@ -594,7 +583,7 @@ static int sgv_alloc_sg_entries(struct s
|
||||
gfp_mask |= __GFP_ZERO;
|
||||
#endif
|
||||
|
||||
- for (pg = 0; pg < pages; pg++) {
|
||||
+ for (pg = 0; pg < pages; pg += 1 << alloc_order) {
|
||||
void *rc;
|
||||
#ifdef CONFIG_SCST_DEBUG_OOM
|
||||
if (((gfp_mask & __GFP_NOFAIL) != __GFP_NOFAIL) &&
|
||||
@@ -603,7 +592,7 @@ static int sgv_alloc_sg_entries(struct s
|
||||
else
|
||||
#endif
|
||||
rc = alloc_fns->alloc_pages_fn(&sg[sg_count], gfp_mask,
|
||||
- priv);
|
||||
+ alloc_order, priv);
|
||||
if (rc == NULL)
|
||||
goto out_no_mem;
|
||||
|
||||
@@ -623,8 +612,8 @@ static int sgv_alloc_sg_entries(struct s
|
||||
if (merged == -1)
|
||||
sg_count++;
|
||||
|
||||
- TRACE_MEM("pg=%d, merged=%d, sg_count=%d", pg, merged,
|
||||
- sg_count);
|
||||
+ TRACE_MEM("pg=%d, merged=%d, sg_count=%d",
|
||||
+ pg, merged, sg_count);
|
||||
}
|
||||
|
||||
if ((clustering_type != sgv_no_clustering) && (trans_tbl != NULL)) {
|
||||
@@ -645,7 +634,7 @@ out:
|
||||
return sg_count;
|
||||
|
||||
out_no_mem:
|
||||
- alloc_fns->free_pages_fn(sg, sg_count, priv);
|
||||
+ alloc_fns->free_pages_fn(sg, sg_count, alloc_order, priv);
|
||||
sg_count = 0;
|
||||
goto out;
|
||||
}
|
||||
@@ -704,32 +693,16 @@ out_free:
|
||||
goto out;
|
||||
}
|
||||
|
||||
-static struct sgv_pool_obj *sgv_get_obj(struct sgv_pool *pool, int cache_num,
|
||||
- int pages, gfp_t gfp_mask, bool get_new)
|
||||
+static struct sgv_pool_obj *sgv_create_obj(struct sgv_pool *pool,
|
||||
+ int cache_num,
|
||||
+ int pages, gfp_t gfp_mask,
|
||||
+ int locked)
|
||||
{
|
||||
struct sgv_pool_obj *obj;
|
||||
|
||||
- spin_lock_bh(&pool->sgv_pool_lock);
|
||||
-
|
||||
- if (unlikely(get_new)) {
|
||||
- /* Used only for buffers preallocation */
|
||||
- goto get_new;
|
||||
- }
|
||||
-
|
||||
- if (likely(!list_empty(&pool->recycling_lists[cache_num]))) {
|
||||
- obj = list_entry(pool->recycling_lists[cache_num].next,
|
||||
- struct sgv_pool_obj, recycling_list_entry);
|
||||
-
|
||||
- list_del(&obj->sorted_recycling_list_entry);
|
||||
- list_del(&obj->recycling_list_entry);
|
||||
-
|
||||
- pool->inactive_cached_pages -= pages;
|
||||
-
|
||||
- spin_unlock_bh(&pool->sgv_pool_lock);
|
||||
- goto out;
|
||||
- }
|
||||
+ if (!locked)
|
||||
+ spin_lock_bh(&pool->sgv_pool_lock);
|
||||
|
||||
-get_new:
|
||||
if (pool->cached_entries == 0) {
|
||||
TRACE_MEM("Adding pool %p to the active list", pool);
|
||||
spin_lock_bh(&sgv_pools_lock);
|
||||
@@ -759,6 +732,57 @@ get_new:
|
||||
spin_unlock_bh(&pool->sgv_pool_lock);
|
||||
}
|
||||
|
||||
+ return obj;
|
||||
+}
|
||||
+
|
||||
+/* FZ Notes: cache_num == order, and we should have pages = 1 << cache_num. */
|
||||
+static struct sgv_pool_obj *sgv_get_obj(struct sgv_pool *pool, int cache_num,
|
||||
+ int pages, gfp_t gfp_mask,
|
||||
+ int max_sg_count, bool get_new)
|
||||
+{
|
||||
+ struct sgv_pool_obj *obj;
|
||||
+
|
||||
+ spin_lock_bh(&pool->sgv_pool_lock);
|
||||
+
|
||||
+ if (unlikely(get_new)) {
|
||||
+ /* Used only for buffers preallocation */
|
||||
+ /* TODO: caller of that should now call
|
||||
+ * sgv_create_obj, and this will go away. */
|
||||
+ goto get_new;
|
||||
+ }
|
||||
+
|
||||
+ if (likely(!list_empty(&pool->recycling_lists[cache_num]))) {
|
||||
+ list_for_each_entry(obj, &pool->recycling_lists[cache_num],
|
||||
+ recycling_list_entry) {
|
||||
+
|
||||
+ TRACE_MEM("obj %p, sg_count %d (max %d)", obj,
|
||||
+ obj->sg_count, max_sg_count);
|
||||
+
|
||||
+ if (unlikely(obj->sg_count > max_sg_count))
|
||||
+ continue;
|
||||
+
|
||||
+ obj = list_entry(pool->recycling_lists[cache_num].next,
|
||||
+ struct sgv_pool_obj,
|
||||
+ recycling_list_entry);
|
||||
+
|
||||
+ list_del(&obj->sorted_recycling_list_entry);
|
||||
+ list_del(&obj->recycling_list_entry);
|
||||
+
|
||||
+ pool->inactive_cached_pages -= pages;
|
||||
+
|
||||
+ spin_unlock_bh(&pool->sgv_pool_lock);
|
||||
+
|
||||
+ /* FZ: note entirely sure of that check. Need
|
||||
+ * to investigate. */
|
||||
+ /*EXTRACHECKS_BUG_ON(obj->alloc_order <= cache_num);*/
|
||||
+
|
||||
+ goto out;
|
||||
+ }
|
||||
+ }
|
||||
+
|
||||
+get_new:
|
||||
+ obj = sgv_create_obj(pool, cache_num, pages, gfp_mask, true);
|
||||
+
|
||||
out:
|
||||
return obj;
|
||||
}
|
||||
@@ -908,14 +932,17 @@ static void sgv_uncheck_allowed_mem(stru
|
||||
*/
|
||||
struct scatterlist *sgv_pool_alloc(struct sgv_pool *pool, unsigned int size,
|
||||
gfp_t gfp_mask, int flags, int *count,
|
||||
- struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv)
|
||||
+ struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv,
|
||||
+ int max_sg_count)
|
||||
{
|
||||
struct sgv_pool_obj *obj;
|
||||
int cache_num, pages, cnt;
|
||||
struct scatterlist *res = NULL;
|
||||
int pages_to_alloc;
|
||||
+ int alloc_order;
|
||||
int no_cached = flags & SGV_POOL_ALLOC_NO_CACHED;
|
||||
bool allowed_mem_checked = false, hiwmk_checked = false;
|
||||
+ int tmp;
|
||||
|
||||
TRACE_ENTRY();
|
||||
|
||||
@@ -958,7 +985,7 @@ struct scatterlist *sgv_pool_alloc(struc
|
||||
allowed_mem_checked = true;
|
||||
|
||||
obj = sgv_get_obj(pool, cache_num, pages_to_alloc, gfp_mask,
|
||||
- flags & SGV_POOL_ALLOC_GET_NEW);
|
||||
+ max_sg_count, flags & SGV_POOL_ALLOC_GET_NEW);
|
||||
if (unlikely(obj == NULL)) {
|
||||
TRACE(TRACE_OUT_OF_MEM, "Allocation of "
|
||||
"sgv_pool_obj failed (size %d)", size);
|
||||
@@ -967,7 +994,30 @@ struct scatterlist *sgv_pool_alloc(struc
|
||||
|
||||
if (obj->sg_count != 0) {
|
||||
TRACE_MEM("Cached obj %p", obj);
|
||||
- atomic_inc(&pool->cache_acc[cache_num].hit_alloc);
|
||||
+
|
||||
+ if (unlikely(max_sg_count < obj->sg_count)) {
|
||||
+ TRACE_MEM("Too many SG entries %d (max %d)",
|
||||
+ obj->sg_count, max_sg_count);
|
||||
+
|
||||
+ sgv_put_obj(obj);
|
||||
+
|
||||
+ obj = sgv_create_obj(pool, cache_num,
|
||||
+ pages_to_alloc, gfp_mask,
|
||||
+ false);
|
||||
+ if (obj &&
|
||||
+ unlikely(max_sg_count < obj->sg_count)) {
|
||||
+ sgv_put_obj(obj);
|
||||
+ obj = NULL;
|
||||
+ }
|
||||
+
|
||||
+ if (obj == NULL) {
|
||||
+ TRACE(TRACE_OUT_OF_MEM, "Allocation of "
|
||||
+ "sgv_pool_obj failed (size %d)",
|
||||
+ size);
|
||||
+ goto out_fail;
|
||||
+ }
|
||||
+ } else
|
||||
+ atomic_inc(&pool->cache_acc[cache_num].hit_alloc);
|
||||
goto success;
|
||||
}
|
||||
|
||||
@@ -1045,16 +1095,44 @@ struct scatterlist *sgv_pool_alloc(struc
|
||||
TRACE_MEM("Big or no_cached obj %p (size %d)", obj, sz);
|
||||
}
|
||||
|
||||
- obj->sg_count = sgv_alloc_sg_entries(obj->sg_entries,
|
||||
- pages_to_alloc, gfp_mask, pool->clustering_type,
|
||||
- obj->trans_tbl, &pool->alloc_fns, priv);
|
||||
- if (unlikely(obj->sg_count <= 0)) {
|
||||
- obj->sg_count = 0;
|
||||
- if ((flags & SGV_POOL_RETURN_OBJ_ON_ALLOC_FAIL) &&
|
||||
- (cache_num >= 0))
|
||||
- goto out_return1;
|
||||
- else
|
||||
- goto out_fail_free_sg_entries;
|
||||
+ /* Allocate the scatter gather entries. Since the memory we
|
||||
+ * request may fit in too many entries, we try to start with
|
||||
+ * an order big enough. That will save some useless
|
||||
+ * allocations. */
|
||||
+ alloc_order = 0;
|
||||
+ tmp = pages_to_alloc;
|
||||
+ while (tmp > max_sg_count) {
|
||||
+ tmp >>= 1;
|
||||
+ alloc_order++;
|
||||
+ }
|
||||
+
|
||||
+ while (1) {
|
||||
+ obj->sg_count = sgv_alloc_sg_entries(obj->sg_entries,
|
||||
+ pages_to_alloc,
|
||||
+ gfp_mask,
|
||||
+ pool->clustering_type,
|
||||
+ obj->trans_tbl,
|
||||
+ &pool->alloc_fns,
|
||||
+ alloc_order, priv);
|
||||
+ if (unlikely(obj->sg_count <= 0)) {
|
||||
+ obj->sg_count = 0;
|
||||
+ if ((flags & SGV_POOL_RETURN_OBJ_ON_ALLOC_FAIL) &&
|
||||
+ (cache_num >= 0))
|
||||
+ goto out_return1;
|
||||
+ else
|
||||
+ goto out_fail_free_sg_entries;
|
||||
+ }
|
||||
+
|
||||
+ obj->alloc_order = alloc_order;
|
||||
+
|
||||
+ if (likely(obj->sg_count <= max_sg_count))
|
||||
+ break;
|
||||
+
|
||||
+ obj->owner_pool->alloc_fns.free_pages_fn(obj->sg_entries,
|
||||
+ obj->sg_count,
|
||||
+ obj->alloc_order,
|
||||
+ obj->allocator_priv);
|
||||
+ alloc_order++;
|
||||
}
|
||||
|
||||
if (cache_num >= 0) {
|
||||
@@ -1230,7 +1308,7 @@ void sgv_pool_free(struct sgv_pool_obj *
|
||||
sgv_put_obj(obj);
|
||||
} else {
|
||||
obj->owner_pool->alloc_fns.free_pages_fn(obj->sg_entries,
|
||||
- obj->sg_count, obj->allocator_priv);
|
||||
+ obj->sg_count, obj->alloc_order, obj->allocator_priv);
|
||||
kfree(obj);
|
||||
sgv_hiwmk_uncheck(pages);
|
||||
}
|
||||
@@ -1289,7 +1367,7 @@ struct scatterlist *scst_alloc(int size,
|
||||
* So, let's always don't use clustering.
|
||||
*/
|
||||
cnt = sgv_alloc_sg_entries(res, pages, gfp_mask, sgv_no_clustering,
|
||||
- NULL, &sys_alloc_fns, NULL);
|
||||
+ NULL, &sys_alloc_fns, 0, NULL);
|
||||
if (cnt <= 0)
|
||||
goto out_free;
|
||||
|
||||
@@ -1326,7 +1404,7 @@ void scst_free(struct scatterlist *sg, i
|
||||
|
||||
sgv_hiwmk_uncheck(count);
|
||||
|
||||
- sgv_free_sys_sg_entries(sg, count, NULL);
|
||||
+ sgv_free_sys_sg_entries(sg, count, 0, NULL);
|
||||
kfree(sg);
|
||||
return;
|
||||
}
|
||||
@@ -1580,8 +1658,9 @@ static void sgv_pool_destroy(struct sgv_
|
||||
* See the SGV pool documentation for more details.
|
||||
*/
|
||||
void sgv_pool_set_allocator(struct sgv_pool *pool,
|
||||
- struct page *(*alloc_pages_fn)(struct scatterlist *, gfp_t, void *),
|
||||
- void (*free_pages_fn)(struct scatterlist *, int, void *))
|
||||
+ struct page *(*alloc_pages_fn)(struct scatterlist *, gfp_t,
|
||||
+ int, void *),
|
||||
+ void (*free_pages_fn)(struct scatterlist *, int, int, void *))
|
||||
{
|
||||
pool->alloc_fns.alloc_pages_fn = alloc_pages_fn;
|
||||
pool->alloc_fns.free_pages_fn = free_pages_fn;
|
||||
Index: scst/src/dev_handlers/scst_user.c
|
||||
===================================================================
|
||||
--- scst/src/dev_handlers/scst_user.c (revision 3134)
|
||||
+++ scst/src/dev_handlers/scst_user.c (working copy)
|
||||
@@ -163,9 +163,9 @@ static int dev_user_disk_done(struct scs
|
||||
static int dev_user_tape_done(struct scst_cmd *cmd);
|
||||
|
||||
static struct page *dev_user_alloc_pages(struct scatterlist *sg,
|
||||
- gfp_t gfp_mask, void *priv);
|
||||
+ gfp_t gfp_mask, int alloc_order, void *priv);
|
||||
static void dev_user_free_sg_entries(struct scatterlist *sg, int sg_count,
|
||||
- void *priv);
|
||||
+ int alloc_order, void *priv);
|
||||
|
||||
static void dev_user_add_to_ready(struct scst_user_cmd *ucmd);
|
||||
|
||||
@@ -392,7 +392,7 @@ static void dev_user_free_ucmd(struct sc
|
||||
}
|
||||
|
||||
static struct page *dev_user_alloc_pages(struct scatterlist *sg,
|
||||
- gfp_t gfp_mask, void *priv)
|
||||
+ gfp_t gfp_mask, int alloc_order, void *priv)
|
||||
{
|
||||
struct scst_user_cmd *ucmd = (struct scst_user_cmd *)priv;
|
||||
int offset = 0;
|
||||
@@ -401,8 +401,11 @@ static struct page *dev_user_alloc_pages
|
||||
|
||||
/* *sg supposed to be zeroed */
|
||||
|
||||
- TRACE_MEM("ucmd %p, ubuff %lx, ucmd->cur_data_page %d", ucmd,
|
||||
- ucmd->ubuff, ucmd->cur_data_page);
|
||||
+ TRACE_MEM("ucmd %p, ubuff %lx, ucmd->cur_data_page %d, alloc_order %d",
|
||||
+ ucmd, ucmd->ubuff, ucmd->cur_data_page, alloc_order);
|
||||
+
|
||||
+ if (unlikely(alloc_order != 0))
|
||||
+ goto out;
|
||||
|
||||
if (ucmd->cur_data_page == 0) {
|
||||
TRACE_MEM("ucmd->first_page_offset %d",
|
||||
@@ -495,7 +498,7 @@ static void __dev_user_free_sg_entries(s
|
||||
}
|
||||
|
||||
static void dev_user_free_sg_entries(struct scatterlist *sg, int sg_count,
|
||||
- void *priv)
|
||||
+ int alloc_order, void *priv)
|
||||
{
|
||||
struct scst_user_cmd *ucmd = (struct scst_user_cmd *)priv;
|
||||
|
||||
@@ -582,7 +585,8 @@ static int dev_user_alloc_sg(struct scst
|
||||
ucmd->buff_cached = cached_buff;
|
||||
|
||||
cmd->sg = sgv_pool_alloc(pool, bufflen, gfp_mask, flags, &cmd->sg_cnt,
|
||||
- &ucmd->sgv, &dev->udev_mem_lim, ucmd);
|
||||
+ &ucmd->sgv, &dev->udev_mem_lim, ucmd,
|
||||
+ cmd->tgt_dev->max_sg_cnt);
|
||||
if (cmd->sg != NULL) {
|
||||
struct scst_user_cmd *buf_ucmd =
|
||||
(struct scst_user_cmd *)sgv_get_priv(ucmd->sgv);
|
||||
@@ -614,20 +618,7 @@ static int dev_user_alloc_sg(struct scst
|
||||
cmd, cmd->out_sg, cmd->out_sg_cnt, cmd->sg_cnt);
|
||||
}
|
||||
|
||||
- if (unlikely(cmd->sg_cnt > cmd->tgt_dev->max_sg_cnt)) {
|
||||
- static int ll;
|
||||
- if ((ll < 10) || TRACING_MINOR()) {
|
||||
- PRINT_INFO("Unable to complete command due to "
|
||||
- "SG IO count limitation (requested %d, "
|
||||
- "available %d, tgt lim %d)",
|
||||
- cmd->sg_cnt, cmd->tgt_dev->max_sg_cnt,
|
||||
- cmd->tgt->sg_tablesize);
|
||||
- ll++;
|
||||
- }
|
||||
- cmd->sg = NULL;
|
||||
- /* sgv will be freed in dev_user_free_sgv() */
|
||||
- res = -1;
|
||||
- }
|
||||
+ EXTRACHECKS_BUG_ON(cmd->sg_cnt > cmd->tgt_dev->max_sg_cnt);
|
||||
} else {
|
||||
TRACE_MEM("Buf not alloced (ucmd %p, h %d, buff_cached, %d, "
|
||||
"sg_cnt %d, ubuff %lx, sgv %p", ucmd, ucmd->h,
|
||||
@@ -3137,6 +3128,14 @@ static int dev_user_prealloc_buffer(stru
|
||||
|
||||
TRACE_ENTRY();
|
||||
|
||||
+ {
|
||||
+ /* The SGV patch cannot support that feature because
|
||||
+ * we don't know either the target or the number of SG
|
||||
+ * buffer of the target. */
|
||||
+ res = -EINVAL;
|
||||
+ goto out;
|
||||
+ }
|
||||
+
|
||||
mutex_lock(&dev_priv_mutex);
|
||||
dev = (struct scst_user_dev *)file->private_data;
|
||||
res = dev_user_check_reg(dev);
|
||||
@@ -3188,7 +3187,7 @@ static int dev_user_prealloc_buffer(stru
|
||||
pool = dev->pool;
|
||||
|
||||
sg = sgv_pool_alloc(pool, bufflen, GFP_KERNEL, SGV_POOL_ALLOC_GET_NEW,
|
||||
- &sg_cnt, &ucmd->sgv, &dev->udev_mem_lim, ucmd);
|
||||
+ &sg_cnt, &ucmd->sgv, &dev->udev_mem_lim, ucmd, 0);
|
||||
if (sg != NULL) {
|
||||
struct scst_user_cmd *buf_ucmd =
|
||||
(struct scst_user_cmd *)sgv_get_priv(ucmd->sgv);
|
||||
445
www/sgv_big_order_alloc.diff
Normal file
445
www/sgv_big_order_alloc.diff
Normal file
@@ -0,0 +1,445 @@
|
||||
In the pass-through mode (i.e. using the pass-through device handlers
|
||||
scst_disk, scst_tape, etc) SCSI commands, coming from remote initiators,
|
||||
are passed to local SCSI hardware on target as is, without any
|
||||
modifications. As any other hardware, the local SCSI hardware can not
|
||||
handle commands with amount of data and/or segments count in
|
||||
scatter-gather array bigger some values. If you have this issue you will
|
||||
see symptoms like small transfers work well, but large ones stall and
|
||||
messages like: "Unable to complete command due to SG IO count
|
||||
limitation" are printed in the kernel logs.
|
||||
|
||||
This is proposed patch to solve that. It allows SGV cache do allocation
|
||||
of pages with order > 0, i.e. more than 1 page per SG entry.
|
||||
|
||||
Compile tested only.
|
||||
|
||||
Index: scst/include/scst.h
|
||||
===================================================================
|
||||
--- scst/include/scst.h (revision 558)
|
||||
+++ scst/include/scst.h (working copy)
|
||||
@@ -2649,12 +2649,13 @@ struct sgv_pool *sgv_pool_create(const c
|
||||
void sgv_pool_destroy(struct sgv_pool *pool);
|
||||
|
||||
void sgv_pool_set_allocator(struct sgv_pool *pool,
|
||||
- struct page *(*alloc_pages_fn)(struct scatterlist *, gfp_t, void *),
|
||||
- void (*free_pages_fn)(struct scatterlist *, int, void *));
|
||||
+ struct page *(*alloc_pages_fn)(struct scatterlist *, gfp_t, void *, int),
|
||||
+ void (*free_pages_fn)(struct scatterlist *, int, void *, int));
|
||||
|
||||
struct scatterlist *sgv_pool_alloc(struct sgv_pool *pool, unsigned int size,
|
||||
gfp_t gfp_mask, int flags, int *count,
|
||||
- struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv);
|
||||
+ struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv,
|
||||
+ int max_sg_count);
|
||||
void sgv_pool_free(struct sgv_pool_obj *sgv, struct scst_mem_lim *mem_lim);
|
||||
|
||||
void *sgv_get_priv(struct sgv_pool_obj *sgv);
|
||||
Index: scst/src/scst_mem.h
|
||||
===================================================================
|
||||
--- scst/src/scst_mem.h (revision 558)
|
||||
+++ scst/src/scst_mem.h (working copy)
|
||||
@@ -36,6 +36,8 @@ struct sgv_pool_obj {
|
||||
/* if <0 - pages, >0 - order */
|
||||
int order_or_pages;
|
||||
|
||||
+ int alloc_order;
|
||||
+
|
||||
struct {
|
||||
/* jiffies, protected by pool_mgr_lock */
|
||||
unsigned long time_stamp;
|
||||
@@ -67,9 +69,9 @@ struct sgv_pool_cache_acc {
|
||||
|
||||
struct sgv_pool_alloc_fns {
|
||||
struct page *(*alloc_pages_fn)(struct scatterlist *sg, gfp_t gfp_mask,
|
||||
- void *priv);
|
||||
+ void *priv, int alloc_order);
|
||||
void (*free_pages_fn)(struct scatterlist *sg, int sg_count,
|
||||
- void *priv);
|
||||
+ void *priv, int alloc_order);
|
||||
};
|
||||
|
||||
struct sgv_pool {
|
||||
Index: scst/src/scst_lib.c
|
||||
===================================================================
|
||||
--- scst/src/scst_lib.c (revision 558)
|
||||
+++ scst/src/scst_lib.c (working copy)
|
||||
@@ -1663,34 +1663,18 @@ int scst_alloc_space(struct scst_cmd *cm
|
||||
flags |= SCST_POOL_ALLOC_NO_CACHED;
|
||||
|
||||
cmd->sg = sgv_pool_alloc(tgt_dev->pool, cmd->bufflen, gfp_mask, flags,
|
||||
- &cmd->sg_cnt, &cmd->sgv, &cmd->dev->dev_mem_lim, NULL);
|
||||
+ &cmd->sg_cnt, &cmd->sgv, &cmd->dev->dev_mem_lim, NULL,
|
||||
+ tgt_dev->max_sg_cnt);
|
||||
if (cmd->sg == NULL)
|
||||
goto out;
|
||||
|
||||
- if (unlikely(cmd->sg_cnt > tgt_dev->max_sg_cnt)) {
|
||||
- static int ll;
|
||||
- if (ll < 10) {
|
||||
- PRINT_INFO("Unable to complete command due to "
|
||||
- "SG IO count limitation (requested %d, "
|
||||
- "available %d, tgt lim %d)", cmd->sg_cnt,
|
||||
- tgt_dev->max_sg_cnt, cmd->tgt->sg_tablesize);
|
||||
- ll++;
|
||||
- }
|
||||
- goto out_sg_free;
|
||||
- }
|
||||
+ EXTRACHECKS_BUG_ON(cmd->sg_cnt > tgt_dev->max_sg_cnt);
|
||||
|
||||
res = 0;
|
||||
|
||||
out:
|
||||
TRACE_EXIT();
|
||||
return res;
|
||||
-
|
||||
-out_sg_free:
|
||||
- sgv_pool_free(cmd->sgv, &cmd->dev->dev_mem_lim);
|
||||
- cmd->sgv = NULL;
|
||||
- cmd->sg = NULL;
|
||||
- cmd->sg_cnt = 0;
|
||||
- goto out;
|
||||
}
|
||||
|
||||
void scst_release_space(struct scst_cmd *cmd)
|
||||
Index: scst/src/scst_mem.c
|
||||
===================================================================
|
||||
--- scst/src/scst_mem.c (revision 558)
|
||||
+++ scst/src/scst_mem.c (working copy)
|
||||
@@ -118,7 +118,7 @@ out_head:
|
||||
}
|
||||
|
||||
static void scst_free_sys_sg_entries(struct scatterlist *sg, int sg_count,
|
||||
- void *priv)
|
||||
+ void *priv, int alloc_order)
|
||||
{
|
||||
int i;
|
||||
|
||||
@@ -134,7 +134,7 @@ static void scst_free_sys_sg_entries(str
|
||||
(unsigned long)p, len, pages);
|
||||
|
||||
while (pages > 0) {
|
||||
- int order = 0;
|
||||
+ int order = alloc_order;
|
||||
|
||||
/*
|
||||
* __free_pages() doesn't like freeing pages with not that order with
|
||||
@@ -159,9 +159,9 @@ static void scst_free_sys_sg_entries(str
|
||||
}
|
||||
|
||||
static struct page *scst_alloc_sys_pages(struct scatterlist *sg,
|
||||
- gfp_t gfp_mask, void *priv)
|
||||
+ gfp_t gfp_mask, void *priv, int alloc_order)
|
||||
{
|
||||
- struct page *page = alloc_pages(gfp_mask, 0);
|
||||
+ struct page *page = alloc_pages(gfp_mask, alloc_order);
|
||||
|
||||
sg_set_page(sg, page, PAGE_SIZE, 0);
|
||||
TRACE_MEM("page=%p, sg=%p, priv=%p", page, sg, priv);
|
||||
@@ -174,10 +174,10 @@ static struct page *scst_alloc_sys_pages
|
||||
|
||||
static int scst_alloc_sg_entries(struct scatterlist *sg, int pages,
|
||||
gfp_t gfp_mask, int clustered, struct trans_tbl_ent *trans_tbl,
|
||||
- const struct sgv_pool_alloc_fns *alloc_fns, void *priv)
|
||||
+ const struct sgv_pool_alloc_fns *alloc_fns, void *priv, int alloc_order)
|
||||
{
|
||||
int sg_count = 0;
|
||||
- int pg, i, j;
|
||||
+ int pg, i, j, pg_inc = 1 << alloc_order;
|
||||
int merged = -1;
|
||||
|
||||
TRACE_MEM("pages=%d, clustered=%d", pages, clustered);
|
||||
@@ -189,7 +189,7 @@ static int scst_alloc_sg_entries(struct
|
||||
gfp_mask |= __GFP_ZERO;
|
||||
#endif
|
||||
|
||||
- for (pg = 0; pg < pages; pg++) {
|
||||
+ for (pg = 0; pg < pages; pg += pg_inc) {
|
||||
void *rc;
|
||||
#ifdef CONFIG_SCST_DEBUG_OOM
|
||||
if (((gfp_mask & __GFP_NOFAIL) != __GFP_NOFAIL) &&
|
||||
@@ -198,7 +198,7 @@ static int scst_alloc_sg_entries(struct
|
||||
else
|
||||
#endif
|
||||
rc = alloc_fns->alloc_pages_fn(&sg[sg_count], gfp_mask,
|
||||
- priv);
|
||||
+ priv, alloc_order);
|
||||
if (rc == NULL)
|
||||
goto out_no_mem;
|
||||
if (clustered) {
|
||||
@@ -229,7 +229,7 @@ out:
|
||||
return sg_count;
|
||||
|
||||
out_no_mem:
|
||||
- alloc_fns->free_pages_fn(sg, sg_count, priv);
|
||||
+ alloc_fns->free_pages_fn(sg, sg_count, priv, alloc_order);
|
||||
sg_count = 0;
|
||||
goto out;
|
||||
}
|
||||
@@ -292,7 +292,7 @@ static void sgv_dtor_and_free(struct sgv
|
||||
{
|
||||
if (obj->sg_count != 0) {
|
||||
obj->owner_pool->alloc_fns.free_pages_fn(obj->sg_entries,
|
||||
- obj->sg_count, obj->allocator_priv);
|
||||
+ obj->sg_count, obj->allocator_priv, obj->alloc_order);
|
||||
}
|
||||
if (obj->sg_entries != obj->sg_entries_data) {
|
||||
if (obj->trans_tbl !=
|
||||
@@ -308,6 +308,36 @@ static void sgv_dtor_and_free(struct sgv
|
||||
return;
|
||||
}
|
||||
|
||||
+static struct sgv_pool_obj *sgv_pool_cached_create(struct sgv_pool *pool,
|
||||
+ int order, gfp_t gfp_mask, bool locked)
|
||||
+{
|
||||
+ struct sgv_pool_obj *obj;
|
||||
+ int pages = 1 << order;
|
||||
+
|
||||
+ if (!locked)
|
||||
+ spin_lock_bh(&sgv_pools_mgr.mgr.pool_mgr_lock);
|
||||
+
|
||||
+ pool->acc.cached_entries++;
|
||||
+ pool->acc.cached_pages += pages;
|
||||
+
|
||||
+ spin_unlock_bh(&sgv_pools_mgr.mgr.pool_mgr_lock);
|
||||
+
|
||||
+ obj = kmem_cache_alloc(pool->caches[order],
|
||||
+ gfp_mask & ~(__GFP_HIGHMEM|GFP_DMA));
|
||||
+ if (likely(obj)) {
|
||||
+ memset(obj, 0, sizeof(*obj));
|
||||
+ obj->order_or_pages = order;
|
||||
+ obj->owner_pool = pool;
|
||||
+ } else {
|
||||
+ spin_lock_bh(&sgv_pools_mgr.mgr.pool_mgr_lock);
|
||||
+ pool->acc.cached_entries--;
|
||||
+ pool->acc.cached_pages -= pages;
|
||||
+ spin_unlock_bh(&sgv_pools_mgr.mgr.pool_mgr_lock);
|
||||
+ }
|
||||
+
|
||||
+ return obj;
|
||||
+}
|
||||
+
|
||||
static struct sgv_pool_obj *sgv_pool_cached_get(struct sgv_pool *pool,
|
||||
int order, gfp_t gfp_mask)
|
||||
{
|
||||
@@ -332,23 +362,7 @@ static struct sgv_pool_obj *sgv_pool_cac
|
||||
goto out;
|
||||
}
|
||||
|
||||
- pool->acc.cached_entries++;
|
||||
- pool->acc.cached_pages += pages;
|
||||
-
|
||||
- spin_unlock_bh(&sgv_pools_mgr.mgr.pool_mgr_lock);
|
||||
-
|
||||
- obj = kmem_cache_alloc(pool->caches[order],
|
||||
- gfp_mask & ~(__GFP_HIGHMEM|GFP_DMA));
|
||||
- if (likely(obj)) {
|
||||
- memset(obj, 0, sizeof(*obj));
|
||||
- obj->order_or_pages = order;
|
||||
- obj->owner_pool = pool;
|
||||
- } else {
|
||||
- spin_lock_bh(&sgv_pools_mgr.mgr.pool_mgr_lock);
|
||||
- pool->acc.cached_entries--;
|
||||
- pool->acc.cached_pages -= pages;
|
||||
- spin_unlock_bh(&sgv_pools_mgr.mgr.pool_mgr_lock);
|
||||
- }
|
||||
+ obj = sgv_pool_cached_create(pool, order, gfp_mask, true);
|
||||
|
||||
out:
|
||||
return obj;
|
||||
@@ -546,12 +560,13 @@ static void scst_uncheck_allowed_mem(str
|
||||
|
||||
struct scatterlist *sgv_pool_alloc(struct sgv_pool *pool, unsigned int size,
|
||||
gfp_t gfp_mask, int flags, int *count,
|
||||
- struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv)
|
||||
+ struct sgv_pool_obj **sgv, struct scst_mem_lim *mem_lim, void *priv,
|
||||
+ int max_sg_count)
|
||||
{
|
||||
struct sgv_pool_obj *obj;
|
||||
int order, pages, cnt;
|
||||
struct scatterlist *res = NULL;
|
||||
- int pages_to_alloc;
|
||||
+ int pages_to_alloc, alloc_order;
|
||||
struct kmem_cache *cache;
|
||||
int no_cached = flags & SCST_POOL_ALLOC_NO_CACHED;
|
||||
bool allowed_mem_checked = false, hiwmk_checked = false;
|
||||
@@ -605,7 +620,23 @@ struct scatterlist *sgv_pool_alloc(struc
|
||||
if (obj->sg_count != 0) {
|
||||
TRACE_MEM("Cached sgv_obj %p", obj);
|
||||
EXTRACHECKS_BUG_ON(obj->order_or_pages != order);
|
||||
- atomic_inc(&pool->cache_acc[order].hit_alloc);
|
||||
+
|
||||
+ if (unlikely(max_sg_count < obj->sg_count)) {
|
||||
+ TRACE_MEM("Too many SG entries %d (max %d)",
|
||||
+ obj->sg_count, max_sg_count);
|
||||
+
|
||||
+ sgv_pool_cached_put(obj);
|
||||
+
|
||||
+ obj = sgv_pool_cached_create(pool, order,
|
||||
+ gfp_mask, false);
|
||||
+ if (obj == NULL) {
|
||||
+ TRACE(TRACE_OUT_OF_MEM, "Allocation of "
|
||||
+ "sgv_pool_obj failed (size %d)",
|
||||
+ size);
|
||||
+ goto out_fail;
|
||||
+ }
|
||||
+ } else
|
||||
+ atomic_inc(&pool->cache_acc[order].hit_alloc);
|
||||
goto success;
|
||||
}
|
||||
|
||||
@@ -682,15 +713,27 @@ struct scatterlist *sgv_pool_alloc(struc
|
||||
TRACE_MEM("Big or no_cached sgv_obj %p (size %d)", obj, sz);
|
||||
}
|
||||
|
||||
- obj->sg_count = scst_alloc_sg_entries(obj->sg_entries,
|
||||
- pages_to_alloc, gfp_mask, pool->clustered, obj->trans_tbl,
|
||||
- &pool->alloc_fns, priv);
|
||||
- if (unlikely(obj->sg_count <= 0)) {
|
||||
- obj->sg_count = 0;
|
||||
- if ((flags & SCST_POOL_RETURN_OBJ_ON_ALLOC_FAIL) && cache)
|
||||
- goto out_return1;
|
||||
- else
|
||||
- goto out_fail_free_sg_entries;
|
||||
+ alloc_order = 0;
|
||||
+ while (1) {
|
||||
+ obj->sg_count = scst_alloc_sg_entries(obj->sg_entries,
|
||||
+ pages_to_alloc, gfp_mask, pool->clustered,
|
||||
+ obj->trans_tbl, &pool->alloc_fns, priv, alloc_order);
|
||||
+ if (unlikely(obj->sg_count <= 0)) {
|
||||
+ obj->sg_count = 0;
|
||||
+ if ((flags & SCST_POOL_RETURN_OBJ_ON_ALLOC_FAIL) && cache)
|
||||
+ goto out_return1;
|
||||
+ else
|
||||
+ goto out_fail_free_sg_entries;
|
||||
+ }
|
||||
+ obj->alloc_order = alloc_order;
|
||||
+
|
||||
+ if (max_sg_count >= obj->sg_count)
|
||||
+ break;
|
||||
+
|
||||
+ obj->owner_pool->alloc_fns.free_pages_fn(obj->sg_entries,
|
||||
+ obj->sg_count, obj->allocator_priv,
|
||||
+ obj->alloc_order);
|
||||
+ alloc_order++;
|
||||
}
|
||||
|
||||
if (cache) {
|
||||
@@ -815,7 +858,7 @@ void sgv_pool_free(struct sgv_pool_obj *
|
||||
sgv_pool_cached_put(sgv);
|
||||
} else {
|
||||
sgv->owner_pool->alloc_fns.free_pages_fn(sgv->sg_entries,
|
||||
- sgv->sg_count, sgv->allocator_priv);
|
||||
+ sgv->sg_count, sgv->allocator_priv, sgv->alloc_order);
|
||||
pages = (sgv->sg_count != 0) ? -sgv->order_or_pages : 0;
|
||||
kfree(sgv);
|
||||
sgv_pool_hiwmk_uncheck(pages);
|
||||
@@ -861,7 +904,7 @@ struct scatterlist *scst_alloc(int size,
|
||||
* So, always don't use clustering.
|
||||
*/
|
||||
*count = scst_alloc_sg_entries(res, pages, gfp_mask, 0, NULL,
|
||||
- &sys_alloc_fns, NULL);
|
||||
+ &sys_alloc_fns, NULL, 0);
|
||||
if (*count <= 0)
|
||||
goto out_free;
|
||||
|
||||
@@ -888,7 +931,7 @@ void scst_free(struct scatterlist *sg, i
|
||||
|
||||
sgv_pool_hiwmk_uncheck(count);
|
||||
|
||||
- scst_free_sys_sg_entries(sg, count, NULL);
|
||||
+ scst_free_sys_sg_entries(sg, count, NULL, 0);
|
||||
kfree(sg);
|
||||
return;
|
||||
}
|
||||
@@ -1060,8 +1103,8 @@ void sgv_pool_deinit(struct sgv_pool *po
|
||||
}
|
||||
|
||||
void sgv_pool_set_allocator(struct sgv_pool *pool,
|
||||
- struct page *(*alloc_pages_fn)(struct scatterlist *, gfp_t, void *),
|
||||
- void (*free_pages_fn)(struct scatterlist *, int, void *))
|
||||
+ struct page *(*alloc_pages_fn)(struct scatterlist *, gfp_t, void *, int),
|
||||
+ void (*free_pages_fn)(struct scatterlist *, int, void *, int))
|
||||
{
|
||||
pool->alloc_fns.alloc_pages_fn = alloc_pages_fn;
|
||||
pool->alloc_fns.free_pages_fn = free_pages_fn;
|
||||
Index: scst/src/dev_handlers/scst_user.c
|
||||
===================================================================
|
||||
--- scst/src/dev_handlers/scst_user.c (revision 559)
|
||||
+++ scst/src/dev_handlers/scst_user.c (working copy)
|
||||
@@ -168,9 +168,9 @@ static int dev_user_disk_done(struct scs
|
||||
static int dev_user_tape_done(struct scst_cmd *cmd);
|
||||
|
||||
static struct page *dev_user_alloc_pages(struct scatterlist *sg,
|
||||
- gfp_t gfp_mask, void *priv);
|
||||
+ gfp_t gfp_mask, void *priv, int alloc_order);
|
||||
static void dev_user_free_sg_entries(struct scatterlist *sg, int sg_count,
|
||||
- void *priv);
|
||||
+ void *priv, int alloc_order);
|
||||
|
||||
static void dev_user_add_to_ready(struct scst_user_cmd *ucmd);
|
||||
|
||||
@@ -368,7 +368,7 @@ static void dev_user_free_ucmd(struct sc
|
||||
}
|
||||
|
||||
static struct page *dev_user_alloc_pages(struct scatterlist *sg,
|
||||
- gfp_t gfp_mask, void *priv)
|
||||
+ gfp_t gfp_mask, void *priv, int alloc_order)
|
||||
{
|
||||
struct scst_user_cmd *ucmd = (struct scst_user_cmd *)priv;
|
||||
int offset = 0;
|
||||
@@ -377,8 +377,11 @@ static struct page *dev_user_alloc_pages
|
||||
|
||||
/* *sg supposed to be zeroed */
|
||||
|
||||
- TRACE_MEM("ucmd %p, ubuff %lx, ucmd->cur_data_page %d", ucmd,
|
||||
- ucmd->ubuff, ucmd->cur_data_page);
|
||||
+ TRACE_MEM("ucmd %p, ubuff %lx, ucmd->cur_data_page %d, alloc_order %d",
|
||||
+ ucmd, ucmd->ubuff, ucmd->cur_data_page, alloc_order);
|
||||
+
|
||||
+ if (unlikely(alloc_order != 0))
|
||||
+ goto out;
|
||||
|
||||
if (ucmd->cur_data_page == 0) {
|
||||
TRACE_MEM("ucmd->first_page_offset %d",
|
||||
@@ -468,7 +471,7 @@ static void __dev_user_free_sg_entries(s
|
||||
}
|
||||
|
||||
static void dev_user_free_sg_entries(struct scatterlist *sg, int sg_count,
|
||||
- void *priv)
|
||||
+ void *priv, int alloc_order)
|
||||
{
|
||||
struct scst_user_cmd *ucmd = (struct scst_user_cmd *)priv;
|
||||
|
||||
@@ -537,7 +540,8 @@ static int dev_user_alloc_sg(struct scst
|
||||
ucmd->buff_cached = cached_buff;
|
||||
|
||||
cmd->sg = sgv_pool_alloc(dev->pool, bufflen, gfp_mask, flags,
|
||||
- &cmd->sg_cnt, &ucmd->sgv, &dev->udev_mem_lim, ucmd);
|
||||
+ &cmd->sg_cnt, &ucmd->sgv, &dev->udev_mem_lim, ucmd,
|
||||
+ cmd->tgt_dev->max_sg_cnt);
|
||||
if (cmd->sg != NULL) {
|
||||
struct scst_user_cmd *buf_ucmd =
|
||||
(struct scst_user_cmd *)sgv_get_priv(ucmd->sgv);
|
||||
@@ -559,21 +563,7 @@ static int dev_user_alloc_sg(struct scst
|
||||
"last_len %d, l %d)", ucmd, cached_buff, ucmd->ubuff,
|
||||
last_len, cmd->sg[cmd->sg_cnt-1].length);
|
||||
|
||||
- if (unlikely(cmd->sg_cnt > cmd->tgt_dev->max_sg_cnt)) {
|
||||
- static int ll;
|
||||
- if (ll < 10) {
|
||||
- PRINT_INFO("Unable to complete command due to "
|
||||
- "SG IO count limitation (requested %d, "
|
||||
- "available %d, tgt lim %d)",
|
||||
- cmd->sg_cnt,
|
||||
- cmd->tgt_dev->max_sg_cnt,
|
||||
- cmd->tgt->sg_tablesize);
|
||||
- ll++;
|
||||
- }
|
||||
- cmd->sg = NULL;
|
||||
- /* sgv will be freed in dev_user_free_sgv() */
|
||||
- res = -1;
|
||||
- }
|
||||
+ EXTRACHECKS_BUG_ON(cmd->sg_cnt > cmd->tgt_dev->max_sg_cnt);
|
||||
} else {
|
||||
TRACE_MEM("Buf not alloced (ucmd %p, h %d, buff_cached, %d, "
|
||||
"sg_cnt %d, ubuff %lx, sgv %p", ucmd, ucmd->h,
|
||||
101
www/target_emulex.html
Normal file
101
www/target_emulex.html
Normal file
@@ -0,0 +1,101 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="Fibre Channel target, Emulex target, FC target, FCoE target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>Emulex FC/FCoE target driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
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|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Target driver for Emulex FC/FCoE</h1>
|
||||
<p><img src="images/LPe16002.jpg" width="100" height="120" class="float-left" alt="SCST Emulex">
|
||||
|
||||
<p>The Emulex OneCore Storage FC/FCoE driver (ocs_fc_scst) is developed and maintained by Broadcom. It is available on the
|
||||
<a href="https://www.broadcom.com/products/storage/fibre-channel-host-bus-adapters/onecore-storage-sdk" class="readmore">OneCore Storage SDK</a> page.</p>
|
||||
|
||||
<p>The Emulex OneCore Storage SDK supports the Service Level Interface 4 (SLI-4) API and is compatible with the latest generation of Emulex 8 and 16 Gb/s Fibre Channel HBAs (LPe15000 and LPe16000 series),
|
||||
as well as the latest generation of 10 and 40 Gb/s FCoE UCNAs (OCe14000-series). It supports both target and initiator mode of operation and a number of advanced features: NPIV, T10-PI, etc.</p>
|
||||
|
||||
<p>If you intend to use persistent reservations with this target driver, you may need to apply: <a href="https://sourceforge.net/p/scst/mailman/message/35682659/" class="readmore">this patch</a>.</p>
|
||||
|
||||
<p>Note: The drivers on <a href="http://sourceforge.net/projects/lpfcxxxx/" class="readmore">SourceForge Emulex Drivers</a>
|
||||
are very old, not maintained and not recommended for new designs.</p>
|
||||
|
||||
<br><br>
|
||||
<p class="post-footer align-right">
|
||||
<a href="https://www.broadcom.com/products/storage/fibre-channel-host-bus-adapters/onecore-storage-sdk" class="readmore">Emulex OneCore Storage Drivers</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
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document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
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</script><script type="text/javascript">
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|
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|
||||
</html>
|
||||
95
www/target_fcoe.html
Normal file
95
www/target_fcoe.html
Normal file
@@ -0,0 +1,95 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="Fibre Channel Over Ethernet target, FCoE target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>FCoE Target Driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>FCoE target</h1>
|
||||
<p><img src="images/t_fcoe.gif" width="100" height="120" class="float-left" alt="SCST Fcoe">
|
||||
SCST Fibre Channel over Ethernet (FCoE) target is developed by Open-FCoE team and Joe Eykholt.
|
||||
Since February 2010 the main development place of it is SCST SVN repository.
|
||||
</p>
|
||||
<p>You can download the latest development version from the SCST SVN repository. See the download
|
||||
page how to setup access to it.
|
||||
</p><br><br><br><br>
|
||||
<p class="post-footer align-right">
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
<a href="http://www.open-fcoe.org/" class="readmore">Open-FCoE Site</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
96
www/target_ibmvscsi.html
Normal file
96
www/target_ibmvscsi.html
Normal file
@@ -0,0 +1,96 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SRP target, RDMA target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SRP Target Driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>IBM Virtual SCSI Target</h1>
|
||||
<p>The virtual SCSI (VSCSI) protocol as defined in <a href="http://www.power.org" class="readmore">Power Architecture Standard</a>
|
||||
is a protocol that allows one logical partition (LPAR) to access SCSI targets provided by another LPAR.
|
||||
The LPAR that provides one or more SCSI targets is called the VIO server or
|
||||
VIOS. The ibmvstgt driver is a VIOS driver that makes it possible to access
|
||||
exported target devices via the VSCSI protocol.</p>
|
||||
<p>This driver is based on ibmvstgt driver, but comparing to the original ibmvstgt has a number of important fixes and improvements.
|
||||
The port was made by Bart Van Assche.</p>
|
||||
<p>You can download it from the SCST SVN repository. See the download page how to setup access to it.</p>
|
||||
<br><br><br>
|
||||
<p class="post-footer align-right">
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
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|
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|
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document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
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</script><script type="text/javascript">
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|
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</html>
|
||||
109
www/target_iscsi.html
Normal file
109
www/target_iscsi.html
Normal file
@@ -0,0 +1,109 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="iSCSI target, iSCSI-SCST">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
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|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="http://scst.sourceforge.net">Home</a></li>
|
||||
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|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>ISCSI target driver iSCSI-SCST with iSER support</h1>
|
||||
<p>ISCSI-SCST is an iSCSI target driver for SCST. It was originated from
|
||||
<a href="http://iscsitarget.sourceforge.net/">IET</a>, but then became a deep rework of it with a lot of fixes and improvements in all areas of
|
||||
performance, stability and functionality.</p>
|
||||
|
||||
<p>The latest improvement was addition of iSER support,
|
||||
thanks a lot to Yan Burman and Mellanox Technologies!</p>
|
||||
|
||||
<p>If you are an IET user before installation carefully read README files of both iSCSI-SCST and
|
||||
the SCST core. You can also use a migration tool developed by Scalable Informatics Inc., which will
|
||||
convert your IET machine to an iSCSI-SCST machine. See README for more details.</p>
|
||||
|
||||
<p>You can find the latest development version of this driver in the SCST SVN. See the download page how to setup
|
||||
access to it.</p>
|
||||
|
||||
<h1>Certification</h1>
|
||||
|
||||
<p>ISCSI-SCST has passed VMware certification as part of
|
||||
<a href="http://scalecomputing.com/products">Scale’s Intelligent Clustered Storage</a> technology developed by
|
||||
<a href="http://scalecomputing.com">Scale Computing</a> as well as VMware and Microsoft certification as part of
|
||||
storage arrays developed by <a href="http://www.open-e.com/">Open-E, Inc</a> and
|
||||
Starboard Storage.</p>
|
||||
|
||||
<p class="post-footer align-right">
|
||||
<a href="iscsi-scst-howto.txt" class="readmore">HOWTO</a>
|
||||
<a href="http://community.mellanox.com/docs/DOC-1479" class="readmore">iSER HOWTO</a>
|
||||
<a href="SCST_Gentoo_HOWTO.txt" class="readmore">Gentoo HOWTO</a>
|
||||
<a href="downloads.html" class="readmore">Download</a>
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
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|
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piwik_idsite = 1;
|
||||
piwik_url = pkBaseURL + "piwik.php";
|
||||
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|
||||
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|
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|
||||
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|
||||
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|
||||
</html>
|
||||
104
www/target_local.html
Normal file
104
www/target_local.html
Normal file
@@ -0,0 +1,104 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCSI target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>Local Target Driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Target driver for local access</h1>
|
||||
|
||||
<p>This driver allows you to access devices that are exported via SCST
|
||||
directly on the same Linux system that they are exported from. </p>
|
||||
|
||||
<p>It makes no assumptions in the code about the device types on the target, so
|
||||
any device handlers that you load in SCST will be visible, including tapes
|
||||
and so forth.</p>
|
||||
|
||||
<p>Additionally, this driver allows creation of fully functional target drivers in user space.
|
||||
See README for more details.</p>
|
||||
|
||||
<p>This driver was made by Richard Sharpe.</p>
|
||||
|
||||
<p>You can download
|
||||
the latest development version from the SCST SVN repository. See the
|
||||
download page how to setup access to it. </p><br><br><br>
|
||||
<p class="post-footer align-right">
|
||||
<a href="downloads.html" class="readmore">Download</a>
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
</script>
|
||||
<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
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|
||||
</body>
|
||||
</html>
|
||||
99
www/target_lsi.html
Normal file
99
www/target_lsi.html
Normal file
@@ -0,0 +1,99 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="Parallel SCSI target, Wide SCSI target, SAS target, LSI target, Fibre Channel target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>LSI Target Driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Target driver for LSI/MPT adapters</h1>
|
||||
<p><img src="images/t_lsi.gif" width="100" height="120" class="float-left" alt="SCST LSI">
|
||||
Target driver for LSI/MPT adapters was originally developed by Hu Gang, then Erik Habbinga has continued the development. </p>
|
||||
|
||||
<p>It supports parallel SCSI (SPI), including Wide SCSI, and Fibre Channel, but also should work with SAS. This driver is on the
|
||||
alpha stage and available for download from the SCST SVN repository. See the download page how to setup access to it.
|
||||
</p>
|
||||
|
||||
<p>Recently Theodore Vaida updated it for the latest hardware generation, including 12G support. You can download current version
|
||||
from <a href="https://github.com/exactassembly/meta-xa-stm">Github</a>.</p>
|
||||
|
||||
<br><br><br>
|
||||
<p class="post-footer align-right">
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
<a href="https://github.com/exactassembly/meta-xa-stm" class="readmore">Github</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
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|
||||
piwik_idsite = 1;
|
||||
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|
||||
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|
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</script>
|
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<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
<!-- End Piwik Tag -->
|
||||
</body>
|
||||
</html>
|
||||
93
www/target_mvsas.html
Normal file
93
www/target_mvsas.html
Normal file
@@ -0,0 +1,93 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCSI target, SAS target, Marvell target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>Marvell SAS Target Driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Target driver for Marvell SAS adapters</h1>
|
||||
<p><img src="images/t_sas.gif" width="100" height="120" class="float-left" alt="SCST Marvell SAS">
|
||||
<p>Target driver for Marvell SAS adapters is developed by Marvell and Andy Yan. It is fully functional
|
||||
SAS target driver.</p>
|
||||
|
||||
<p>It is on the beta stage. You can download it from the SCST SVN repository. See the download page how
|
||||
to setup access to it. </p><br><br><br>
|
||||
<p class="post-footer align-right">
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names">Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
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|
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piwik_idsite = 1;
|
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piwik_url = pkBaseURL + "piwik.php";
|
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|
||||
</script>
|
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<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
<!-- End Piwik Tag -->
|
||||
</body>
|
||||
</html>
|
||||
129
www/target_old.html
Normal file
129
www/target_old.html
Normal file
@@ -0,0 +1,129 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCST Old Unsupported Target Drivers">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>Old Unsupported SCST Target Drivers</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Target driver for QLogic ISP chipsets</h1>
|
||||
<p><img src="images/t_unsupported.gif" width="100" height="120" class="float-left" alt="SCST Unsupported">
|
||||
This is an SCST driver for ISP QLogic chipsets commonly used in many SCSI and FC host bus adapters.
|
||||
It is based on Matthew Jacob's (<a href="http://www.feral.com">http://www.feral.com</a>)
|
||||
multiplatform driver for ISP chipsets. Update for SCST was made by Stanislaw Gruszka for Open-E Inc.</p>
|
||||
|
||||
<p>The latest release is 1.0.2. It supports kernel versions between 2.6.16 and 2.6.32.</p>
|
||||
<p>This driver is obsoleted in favor of qla2x00t.</p>
|
||||
<br>
|
||||
|
||||
|
||||
<h1>Old target driver for QLogic qla2x00t adapters for 2.4 kernels</h1>
|
||||
<p><img src="images/t_unsupported.gif" width="100" height="120" class="float-left" alt="SCST Unsupported">
|
||||
Old target driver for QLogic qla2x00t adapters is capable to work on 2.4 kernels.
|
||||
It has all required features and looks to be quite stable. It is designed to work in conjunction with the
|
||||
initiator driver, which is intended to perform all the initialization and shutdown tasks. In the current release as
|
||||
a base for the initiator driver was taken Red Hat's driver from the stock 2.4.20 kernel. Then it was patched to
|
||||
enable the target mode and provide all necessary callbacks, and it's still able to work as initiator only. Mode,
|
||||
when a host acts as the initiator and the target simultaneously, is also supported. This driver is obsoleted in
|
||||
favor of 2.6-based driver.</p>
|
||||
<p>The latest version is 0.9.3.4. Requires Linux kernel versions 2.4.20 or higher and SCST version 0.9.3-pre4 or
|
||||
higher. If you are lucky, it works also on 2.6 kernels, see README file for details. Tested on i386 only, but
|
||||
should work on any other supported by Linux platform.</p>
|
||||
<p>Currently it is <strong>not supported</strong> and listed here for historical reasons only.</p>
|
||||
<br>
|
||||
|
||||
<h1>Target drivers for Adaptec 7xxx and QLogic QLA12xx adapters</h1>
|
||||
<p><img src="images/t_unsupported.gif" width="100" height="120" class="float-left" alt="SCST Unsupported">
|
||||
Target drivers for Adaptec 7xxx and QLogic QLA12xx adapters have been developed by Hu Gang and they available for
|
||||
download from <a href="http://bj.soulinfo.com/~hugang/scst/tgt/">http://bj.soulinfo.com/~hugang/scst/tgt/</a>.
|
||||
These drivers are not completed, but looks to be a good starting point if you are going to use one of these adapters.
|
||||
SCST team don't have the appropriate hardware, therefore have not tested and don't support these drivers.
|
||||
Send all questions to <strong>Hu Gang < hugang at soulinfo com ></strong>. If some of these drivers don't compile for
|
||||
you, try again with SCST version 0.9.3-pre2.</p><br><br>
|
||||
<br>
|
||||
|
||||
<h1>Patches for UNH-iSCSI Target 1.5.03 and 1.6.00 to SCST</h1>
|
||||
<p><img src="images/t_unsupported.gif" width="100" height="120" class="float-left" alt="SCST Unsupported">
|
||||
SCST is much more advanced, than the internal mid-level of <a href="http://sourceforge.net/projects/unh-iscsi">
|
||||
UNH-iSCSI target driver</a>. With SCST the iSCSI target benefits from all its features and gets ability to use all
|
||||
its advantages, like high performance and scalability, SMP support, required SCSI functionality emulation, etc.</p>
|
||||
|
||||
<p>Since the interface between SCST and the target drivers is based on work, done by UNH IOL, it was relatively
|
||||
simple to update UNH-iSCSI target to work over SCST. Mostly it was "search and replace" job. The built-in
|
||||
scsi_target remains available as a compile-time option.</p>
|
||||
|
||||
<p>Requires Linux kernel versions 2.4.20 or higher or 2.6.7 or higher and SCST version 0.9.2 or higher.</p>
|
||||
<p>Currently it is <strong>not supported</strong> and listed here for historical reasons only.</p>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
</div>
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
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|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
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document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
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|
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|
||||
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|
||||
114
www/target_qla2x00t.html
Normal file
114
www/target_qla2x00t.html
Normal file
@@ -0,0 +1,114 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="Fibre Channel Target, FC target, QLogic Target, 4Gbps target, 8Gbps target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>QLogic Fibre Channel Target Driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Target driver qla2x00t for QLogic FC adapters</h1>
|
||||
<p><img src="images/t_qlogic.gif" width="100" height="120" class="float-left" alt="SCST QLogic">
|
||||
This is target driver for QLogic qla2xxx (22xx++) Fibre Channel adapters.</p>
|
||||
|
||||
<p>This driver starting from version 3.1 supports 16G Hilda QLogic
|
||||
chip based adapters (post-Hilda QLogic chips not supported) and has many other important improvements.
|
||||
This driver should also support FCoE, but that has never been verified.
|
||||
It has passed intensive internal SanDisk tests. It is stable and production ready.
|
||||
This driver is in stable maintenance mode in favor of the
|
||||
QLogic git tree driver (see below). This is the recommended driver to use in production at the moment.
|
||||
</p>
|
||||
|
||||
<p>You can find the latest updates for this driver in the SVN trunk.</p>
|
||||
|
||||
<p>The latest QLogic maintained version of this driver with full support
|
||||
of the latest QLogic chips for both FC and FCoE, including 32G FC, you can find in
|
||||
git://git.qlogic.com/scst-qla2xxx-unified.git.
|
||||
It is maintained by QLogic, hence located in the QLogic's git. See SVN root README
|
||||
for instructions how to integrate it into the SCST build tree.</p>
|
||||
|
||||
<p>Version released in March 2018 seems to be well functional and stable.
|
||||
However, NPIV, T10-PI as well as modifying port name is not yet supported.
|
||||
Also, this driver does not support old adapters (same as the in-kernel qla2xxx it is based on).</p>
|
||||
|
||||
<p class="post-footer align-right">
|
||||
<a href="qla2x00t-howto.html" class="readmore">HOWTO</a>
|
||||
<a href="https://blog.it-kb.ru/2018/03/12/configure-the-server-with-qlogic-fc-hba-on-debian-linux-9-and-scst-fc-target-as-storage-for-csv-volumes-in-the-hyper-v-cluster-for-highly-available-virtual-machines/" class="readmore"> Russian HOWTO</a>
|
||||
<a href="downloads.html" class="readmore">Download</a>
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/trunk" class="readmore">SCST SVN trunk</a>
|
||||
<a href="scst-qla2xxx-unified-20180330.tgz" class="readmore">QLA git snapshot</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
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|
||||
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<script type="text/javascript">
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|
||||
</html>
|
||||
95
www/target_srp.html
Normal file
95
www/target_srp.html
Normal file
@@ -0,0 +1,95 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SRP target, RDMA target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SRP Target Driver</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>Infiniband SCSI RDMA protocol (SRP) target driver</h1>
|
||||
<p><img src="images/t_rdma.gif" width="100" height="120" class="float-left" alt="SCST SRP">
|
||||
SCSI RDMA Protocol (SRP) target driver has been developed by Vu Pham. Since March
|
||||
2008 the main development place of the SRP target driver is SCST SVN repository.
|
||||
It is maintained by Bart Van Assche.</p>
|
||||
<p>This driver is mainline Linux kernel ready and going to be pushed to it
|
||||
together with other SCST patches.</p>
|
||||
<br><br><br>
|
||||
<p class="post-footer align-right">
|
||||
<a href="downloads.html" class="readmore">Download</a>
|
||||
<a href="http://sourceforge.net/p/scst/svn/HEAD/tree/" class="readmore">SCST SVN Repository</a>
|
||||
</p>
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
<!-- content-wrap ends here -->
|
||||
</div>
|
||||
|
||||
<!-- wrap ends here -->
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
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|
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|
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|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
piwik_action_name = '';
|
||||
piwik_idsite = 1;
|
||||
piwik_url = pkBaseURL + "piwik.php";
|
||||
piwik_log(piwik_action_name, piwik_idsite, piwik_url);
|
||||
</script>
|
||||
<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
<!-- End Piwik Tag -->
|
||||
</body>
|
||||
</html>
|
||||
96
www/targets.html
Normal file
96
www/targets.html
Normal file
@@ -0,0 +1,96 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCST, SCSI target, iSCSI target, Fibre Channel target, FC target, SRP target, RDMA target, LSI target, SAS target, FCoE target">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCST SCSI Target Drivers & Utilities</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li id="current"><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="sidebar">
|
||||
<h1>Target Drivers</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="target_iscsi.html">ISCSI-SCST with iSER</a></li>
|
||||
<li><a href="target_qla2x00t.html">QLogic FC qla2x00t</a></li>
|
||||
<li><a href="target_srp.html">SCSI RDMA Protocol (SRP)</a></li>
|
||||
<li><a href="target_mvsas.html">Marvell SAS adapters</a></li>
|
||||
<li><a href="target_emulex.html">Emulex FC/FCoE</a></li>
|
||||
<li><a href="target_lsi.html">LSI/MPT adapters</a></li>
|
||||
<li><a href="target_fcoe.html">FCoE Target</a></li>
|
||||
<li><a href="target_local.html">Local Target Driver</a></li>
|
||||
<li><a href="target_ibmvscsi.html">IBM pSeries Virtual SCSI</a></li>
|
||||
<li><a href="target_old.html">Old Unsupported</a></li>
|
||||
</ul>
|
||||
<h1>User utilities</h1>
|
||||
<ul class="sidemenu">
|
||||
<li><a href="scst_admin.html">SCST Admin Utility</a></li>
|
||||
<li><a href="handler_fileio_tgt.html">FILEIO_TGT handler</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<div id="main">
|
||||
<h1>SCST Target Drivers</h1>
|
||||
|
||||
<p>SCST has target drivers for:</p>
|
||||
<ul>
|
||||
<li><span>iSCSI with iSER</span></li>
|
||||
<li><span>Fibre Channel QLogic qla2xxx series</span></li>
|
||||
<li><span>Infiniband SCSI RDMA Protocol (SRP)</span></li>
|
||||
<li><span>Marvell SAS adapters</span></li>
|
||||
<li><span>Emulex FC/FCoE</span></li>
|
||||
<li><span>LSI/MPT adapters (parallel SCSI, including Wide Ultra320, SAS, Fibre Channel)</span></li>
|
||||
<li><span>FCoE</span></li>
|
||||
<li><span>Local access</span></li>
|
||||
<li><span>IBM pSeries Virtual SCSI</span></li>
|
||||
<li><span>...</span></li>
|
||||
</ul>
|
||||
|
||||
<table border=0><tr><td height="300px"> </td></tr></table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
var pkBaseURL = (("https:" == document.location.protocol) ? "https://apps.sourceforge.net/piwik/scst/" : "http://apps.sourceforge.net/piwik/scst/");
|
||||
document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
|
||||
</script><script type="text/javascript">
|
||||
piwik_action_name = '';
|
||||
piwik_idsite = 1;
|
||||
piwik_url = pkBaseURL + "piwik.php";
|
||||
piwik_log(piwik_action_name, piwik_idsite, piwik_url);
|
||||
</script>
|
||||
<object><noscript><p><img src="http://apps.sourceforge.net/piwik/scst/piwik.php?idsite=1" alt="piwik"></p></noscript></object>
|
||||
<!-- End Piwik Tag -->
|
||||
</body>
|
||||
</html>
|
||||
52
www/tomasz_res.txt
Normal file
52
www/tomasz_res.txt
Normal file
@@ -0,0 +1,52 @@
|
||||
The target is running Debian Lenny 64bit userspace on an Intel Celeron 2.93GHz CPU, 2 GB RAM.
|
||||
|
||||
Initiator is running Debian Etch 64 bit userspace, open-iscsi 2.0-869, Intel Xeon 3050/2.13GHz, 8 GB RAM.
|
||||
|
||||
|
||||
Each test was repeated 6 times, "sync" was made and caches were dropped on both sides before each test was started.
|
||||
|
||||
dd parameters were like below, so 6.6 GB of data was read each time:
|
||||
|
||||
dd if=/dev/sdag of=/dev/null bs=64k count=100000
|
||||
|
||||
|
||||
Data was read from two block devices:
|
||||
- /dev/md0, which is RAID-1 on two ST31500341AS 1.5 TB drives
|
||||
- encrypted dm-crypt device which is on top of /dev/md0
|
||||
|
||||
Encrypted device was created with the following additional options passed to cryptsetup
|
||||
(it provides the most performance on systems where CPU is a bottleneck, but with decreased
|
||||
security when compared to default options):
|
||||
|
||||
-c aes-ecb-plain -s 128
|
||||
|
||||
|
||||
Generally, CPU on the target was a bottleneck, so I also tested the load on target.
|
||||
|
||||
|
||||
md0, crypt columns - averages from dd
|
||||
us, sy, id, wa - averages from vmstat
|
||||
|
||||
|
||||
1. Disk speeds on the target
|
||||
|
||||
Raw performance: 102.17 MB/s
|
||||
Raw performance (encrypted): 50.21 MB/s
|
||||
|
||||
|
||||
2. Read-ahead on the initiator: 256 (default); md0, crypt - MB/s
|
||||
|
||||
md0 us sy id wa | crypt us sy id wa
|
||||
STGT 50.63 4% 45% 18% 33% | 32.52 3% 62% 16% 19%
|
||||
SCST (debug + no patches) 43.75 0% 26% 30% 44% | 42.05 0% 84% 1% 15%
|
||||
SCST (fullperf + patches) 45.18 0% 25% 33% 42% | 44.12 0% 81% 2% 17%
|
||||
|
||||
|
||||
3. Read-ahead on the initiator: 16384; md0, crypt - MB/s
|
||||
|
||||
md0 us sy id wa | crypt us sy id wa
|
||||
STGT 56.43 3% 55% 2% 40% | 46.90 3% 90% 3% 4%
|
||||
SCST (debug + no patches) 73.85 0% 58% 1% 41% | 42.70 0% 85% 0% 15%
|
||||
SCST (fullperf + patches) 76.27 0% 63% 1% 36% | 42.52 0% 85% 0% 15%
|
||||
|
||||
Measured by Tomasz Chmielewski
|
||||
181
www/users.html
Normal file
181
www/users.html
Normal file
@@ -0,0 +1,181 @@
|
||||
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||||
<html>
|
||||
<head>
|
||||
<meta name="Keywords" content="SCST users">
|
||||
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
||||
<meta name="author" content="Daniel Fernandes">
|
||||
<meta name="Robots" content="index,follow">
|
||||
<link rel="stylesheet" href="images/Orange.css" type="text/css">
|
||||
<title>SCST Users</title>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<script language="javascript" src="images/tooltips.js" type="text/javascript"></script>
|
||||
<div id="mess" style="position: absolute; left: 0; top: 0; display: none; padding: 3px; font-size: 13px; font-family: sans-serif; background: #ffffad; color: #26261f; border: 1px solid #909090"></div>
|
||||
<!-- wrap starts here -->
|
||||
<div id="wrap">
|
||||
<div id="header">
|
||||
<div class="logoimg"></div><h1 id="logo"><span class="orange"></span></h1>
|
||||
<h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2>
|
||||
</div>
|
||||
|
||||
<div id="menu">
|
||||
<ul>
|
||||
<li><a href="index.html">Home</a></li>
|
||||
<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
|
||||
<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
|
||||
<li><a href="targets.html">Drivers</a></li>
|
||||
<li><a href="downloads.html">Downloads</a></li>
|
||||
<li><a href="contributing.html">Contributing</a></li>
|
||||
<li><a href="comparison.html">Comparison</a></li>
|
||||
<li id="current"><a href="users.html">Users</a></li>
|
||||
</ul>
|
||||
</div>
|
||||
|
||||
<!-- content-wrap starts here -->
|
||||
<div id="content-wrap">
|
||||
<div id="main2">
|
||||
<h1>SCST Users</h1>
|
||||
|
||||
<br>
|
||||
|
||||
<span class="companysubtitles">Companies developed SCST target drivers for their adapters</span>
|
||||
|
||||
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="margin: 10px 15px;">
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.avagotech.com/products/server-storage/fibre-channel-host-bus-adapters/onecore-storage-sdk"><img src="images/avago.jpg" alt="Emulex"></a></td>
|
||||
<td class="companybox" width="33%" bgcolor="#0071bb">
|
||||
<a href="https://cavium.com/"><img src="https://cavium.com/images/cavium-logo.png" style="width: 180px; height: 40px" alt="Cavium"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.marvell.com"><img src="http://www.marvell.com/assets/img/logo.png" alt="Marvell Technology Group"></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.mellanox.com"><img src="http://ir.mellanox.com/common/alerts/MLNX/default/logo.gif" alt="Mellanox Technologies"></a></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<br><br>
|
||||
|
||||
<span class="companysubtitles">Companies using SCST in their products and solutions</span>
|
||||
|
||||
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="margin: 10px 15px;">
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="https://www.onestopsystems.com/"><img src="https://www.onestopsystems.com/sites/default/files/onestopsystems-logo.png" style="width: 180px; height: 60px" alt="One Stop Systems"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.axxana.com"><img src="axxana.png" alt="Axxana"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.bloombase.com"><img src="http://www.bloombase.com/img/bloombase_2008_logo.png" alt="Bloombase"></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.datadomain.com"><img src="http://www.emc.com/images/header/logo-emc.gif" alt="Data Domain"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<font size="3" color="black">Enjellic Systems Development</font></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.hp.com"><img src="hp_logo.jpg" alt="Hewlett-Packard"></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%" bgcolor="#3a3c41">
|
||||
<a href="http://www.ibm.com"><img src="http://www.ibm.com/i/v16/t/ibm-logo.gif" alt="IBM"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.inmage.com/"><img src="http://www.inmage.com/uploads/inmage/logo.jpg" alt="InMage"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.iss-integration.com/supercore.html"><img src="images/iss.jpg" alt="Intelligent Systems Services Inc."></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.kaminario.com/"><img src="kaminario.png" alt="Kaminario"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.logicworks.net"><img src="logicworks.png" alt="Logicworks"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.open-e.com"><img src="http://www.open-e.com/site_media/theme_images/logo_open_e.jpg" alt="Open-E, Inc."></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.openfiler.com"><img src="openfiler.png" alt="Openfiler"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://docs.oracle.com/cd/E57980_12/E53251_01/E53251_01.pdf"><img src="oracle_logo.jpg" style="width: 213px; height: 70px" alt="Oracle" onmouseover="tooltip(this, 'Oracle MaxRep for SAN');" onmouseout="hide_info(this);"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="https://github.com/gstanden/orabuntu-lxc"><img src="ORABUNTU_LOGO.png" style="width: 180px; height: 80px" alt="Orabuntu-lxc"></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%" bgcolor="#3a3c41">
|
||||
<a href="http://www.osnexus.com"><img src="http://static1.squarespace.com/static/545a62d4e4b02643996231f0/t/545aa6d4e4b018968b9a709f/1444157883463/?format=1500w" style="width: 180px; height: 40px" alt="OS NEXUS"></a></td>
|
||||
<td class="companybox" width="33%" bgcolor="black">
|
||||
<a href="http://www.pranah.com"><img src="http://www.pranah.com/images/logo_pranah.png" alt="Pranah Storage Technologies"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.proxmox.com"><img src="https://www.proxmox.com/images/proxmox/Proxmox_logo_standard_hex_400px.png" style="width: 180px; height: 40px" alt="Proxmox"></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.qstar.com"><img src="http://www.qstar.com/wp-content/uploads/2017/10/Q_star_logo_small.png" alt="QStar Technologies"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.scalableinformatics.com"><img src="scale_inf.png" alt="Scalable Informatics"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.scalecomputing.com"><img src="https://www.scalecomputing.com/uploads/general-images/social_posts_logo.png" style="width: 180px; height: 80px" alt="Scale Computing"></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.small-tree.com"><img src="https://www.small-tree.com/images/site/logo.gif" alt="Small Tree Communications"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.soul.com.cn"><img src="http://www.soul.com.cn/images/logo.jpg" alt="Soul Information Technology Co., Ltd."></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.starwindsoftware.com"><img src="starwind_logo.png" alt="StarWind Software"></a></td>
|
||||
</tr>
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://systemfabricworks.com"><img src="http://www.systemfabricworks.com/wp-content/uploads/2016/08/sfw-logo1d.png" style="width: 140px; height: 100px" alt="System Fabric Works, Inc."></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.techophil.com/"><img src="http://techophil.com/logo.png" alt="TechoPhil Ltd"></a></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<br><br>
|
||||
|
||||
<span class="companysubtitles">Companies using SCST for their internal storage infrastructure</span>
|
||||
|
||||
<table width="100%" border="0" cellpadding="0" cellspacing="0" style="margin: 10px 15px;">
|
||||
<tr>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.datacrunch.net"><img src="http://www.datacrunch.net/images/general/dc_logo.png" alt="DataCrunch Company"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.ism.nl"><img src="http://www.ism.nl/media/562622/ism-logo.png" alt="ISM eCompany"></a></td>
|
||||
<td class="companybox" width="33%">
|
||||
<a href="http://www.seakr.com"><img src="http://www.millertechnologygroup.com/images/logos/seakrengineeringlogo.gif" alt="SEAKR Engineering, Inc."></a></td>
|
||||
</tr>
|
||||
</table>
|
||||
|
||||
<br>
|
||||
|
||||
<p>If your company is using SCST in its products, solutions or internal storage infrastructure,
|
||||
please contact vst at vlnb net and we will be proud to add you on this page. Also, if your company has certified its
|
||||
SCST-powered product or solution, we will be proud to write on our pages that SCST engine has successfully
|
||||
passed the certification tests. This is the least appreciation your company can do for SCST.</p>
|
||||
|
||||
<table border=0><tr><td height="15px"> </td></tr></table>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<!-- footer starts here -->
|
||||
<div id="footer">
|
||||
<p>© Copyright 2004 - 2018<b><font class="names"> Vladislav Bolkhovitin & others</font></b>
|
||||
Design by: <b><font class="names">Daniel Fernandes</font></b> </p>
|
||||
</div>
|
||||
<!-- footer ends here -->
|
||||
<!-- Piwik -->
|
||||
<script type="text/javascript">
|
||||
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|
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|
||||
</html>
|
||||
220
www/vl_res.txt
Normal file
220
www/vl_res.txt
Normal file
@@ -0,0 +1,220 @@
|
||||
Setup:
|
||||
|
||||
Target: HT 2.4GHz Xeon, x86_32, 2GB of memory limited to 256MB by kernel
|
||||
command line to have less test data footprint, 75GB 15K RPM SCSI disk as
|
||||
backstorage, dual port 1Gbps E1000 Intel network card, 2.6.29 kernel.
|
||||
|
||||
Initiator: 1.7GHz Xeon, x86_32, 1GB of memory limited to 256MB by kernel
|
||||
command line to have less test data footprint, dual port 1Gbps E1000
|
||||
Intel network card, 2.6.27 kernel, open-iscsi 2.0-870-rc3.
|
||||
|
||||
The target exported a 5GB file on XFS for FILEIO and 5GB partition for
|
||||
BLOCKIO.
|
||||
|
||||
All the tests were ran 3 times and average written. All the values are
|
||||
in MB/s. The tests were ran with CFQ and deadline IO schedulers on the
|
||||
target. All other parameters on both target and initiator were default.
|
||||
|
||||
==================================================================
|
||||
|
||||
I. SEQUENTIAL ACCESS OVER SINGLE LINE
|
||||
|
||||
1. # dd if=/dev/sdX of=/dev/null bs=512K count=2000
|
||||
|
||||
ISCSI-SCST IET STGT
|
||||
NULLIO: 106 105 103
|
||||
FILEIO/CFQ: 82 57 55
|
||||
FILEIO/deadline 69 69 67
|
||||
BLOCKIO/CFQ 81 28 -
|
||||
BLOCKIO/deadline 80 66 -
|
||||
|
||||
------------------------------------------------------------------
|
||||
|
||||
2. # dd if=/dev/zero of=/dev/sdX bs=512K count=2000
|
||||
|
||||
I didn't do other write tests, because I have data on those devices.
|
||||
|
||||
ISCSI-SCST IET STGT
|
||||
NULLIO: 114 114 114
|
||||
|
||||
------------------------------------------------------------------
|
||||
|
||||
3. /dev/sdX formatted in ext3 and mounted in /mnt on the initiator. Then
|
||||
|
||||
# dd if=/mnt/q of=/dev/null bs=512K count=2000
|
||||
|
||||
were ran (/mnt/q was created before by the next test)
|
||||
|
||||
ISCSI-SCST IET STGT
|
||||
FILEIO/CFQ: 94 66 46
|
||||
FILEIO/deadline 74 74 72
|
||||
BLOCKIO/CFQ 95 35 -
|
||||
BLOCKIO/deadline 94 95 -
|
||||
|
||||
------------------------------------------------------------------
|
||||
|
||||
4. /dev/sdX formatted in ext3 and mounted in /mnt on the initiator. Then
|
||||
|
||||
# dd if=/dev/zero of=/mnt/q bs=512K count=2000
|
||||
|
||||
were ran (/mnt/q was created by the next test before)
|
||||
|
||||
ISCSI-SCST IET STGT
|
||||
FILEIO/CFQ: 97 91 88
|
||||
FILEIO/deadline 98 96 90
|
||||
BLOCKIO/CFQ 112 110 -
|
||||
BLOCKIO/deadline 112 110 -
|
||||
|
||||
------------------------------------------------------------------
|
||||
|
||||
Conclusions:
|
||||
|
||||
1. ISCSI-SCST FILEIO on buffered READs on 27% faster than IET (94 vs
|
||||
74). With CFQ the difference is 42% (94 vs 66).
|
||||
|
||||
2. ISCSI-SCST FILEIO on buffered READs on 30% faster than STGT (94 vs
|
||||
72). With CFQ the difference is 104% (94 vs 46).
|
||||
|
||||
3. ISCSI-SCST BLOCKIO on buffered READs has about the same performance
|
||||
as IET, but with CFQ it's on 170% faster (95 vs 35).
|
||||
|
||||
4. Buffered WRITEs are not so interesting, because they are async. with
|
||||
many outstanding commands at time, hence latency insensitive, but even
|
||||
here ISCSI-SCST always a bit faster than IET.
|
||||
|
||||
5. STGT always the worst, sometimes considerably.
|
||||
|
||||
6. BLOCKIO on buffered WRITEs is constantly faster, than FILEIO, so,
|
||||
definitely, there is a room for future improvement here.
|
||||
|
||||
7. For some reason assess on file system is considerably better, than
|
||||
the same device directly.
|
||||
|
||||
==================================================================
|
||||
|
||||
II. Mostly random "realistic" access.
|
||||
|
||||
For this test I used io_trash utility. This utility emulates DB-like
|
||||
access. For more details see http://lkml.org/lkml/2008/11/17/444. To
|
||||
show value of target-side caching in this test target was ran with full
|
||||
2GB of memory. I ran io_trash with the following parameters: "2 2 ./
|
||||
500000000 50000000 10 4096 4096 300000 10 90 0 10". Total execution
|
||||
time was measured.
|
||||
|
||||
ISCSI-SCST IET STGT
|
||||
FILEIO/CFQ: 4m45s 5m 5m17s
|
||||
FILEIO/deadline 5m20s 5m22s 5m35s
|
||||
BLOCKIO/CFQ 23m3s 23m5s -
|
||||
BLOCKIO/deadline 23m15s 23m25s -
|
||||
|
||||
Conclusions:
|
||||
|
||||
1. FILEIO on 500% (five times!) faster than BLOCKIO
|
||||
|
||||
2. STGT, as usually, always the worst
|
||||
|
||||
3. Deadline always a bit slower
|
||||
|
||||
==================================================================
|
||||
|
||||
III. SEQUENTIAL ACCESS OVER MPIO
|
||||
|
||||
Unfortunately, my dual port network card isn't capable of simultaneous
|
||||
data transfers, so I had to do some "modeling" and put my network
|
||||
devices in 100Mbps mode. To make this model more realistic I also used
|
||||
my old IDE 5200RPM hard drive capable to produce locally 35MB/s
|
||||
throughput. So I modeled the case of double 1Gbps links with 350MB/s
|
||||
backstorage, if all the following rules satisfied:
|
||||
|
||||
- Both links a capable of simultaneous data transfers
|
||||
|
||||
- There is sufficient amount of CPU power on both initiator and target
|
||||
to cover requirements for the data transfers.
|
||||
|
||||
All the tests were done with iSCSI-SCST only.
|
||||
|
||||
1. # dd if=/dev/sdX of=/dev/null bs=512K count=2000
|
||||
|
||||
NULLIO: 23
|
||||
FILEIO/CFQ: 20
|
||||
FILEIO/deadline 20
|
||||
BLOCKIO/CFQ 20
|
||||
BLOCKIO/deadline 17
|
||||
|
||||
Single line NULLIO is 12.
|
||||
|
||||
So, there is a 96% on NULLIO and 83% with HDD storage improvement using
|
||||
2 lines. With 1Gbps 20MB/s should be equivalent of 200MB/s. Quite good!
|
||||
|
||||
==================================================================
|
||||
|
||||
Connection to the target were made with the following iSCSI parameters:
|
||||
|
||||
# iscsi-scst-adm --op show --tid=1 --sid=0x10000013d0200
|
||||
InitialR2T=No
|
||||
ImmediateData=Yes
|
||||
MaxConnections=1
|
||||
MaxRecvDataSegmentLength=2097152
|
||||
MaxXmitDataSegmentLength=131072
|
||||
MaxBurstLength=2097152
|
||||
FirstBurstLength=262144
|
||||
DefaultTime2Wait=2
|
||||
DefaultTime2Retain=0
|
||||
MaxOutstandingR2T=1
|
||||
DataPDUInOrder=Yes
|
||||
DataSequenceInOrder=Yes
|
||||
ErrorRecoveryLevel=0
|
||||
HeaderDigest=None
|
||||
DataDigest=None
|
||||
OFMarker=No
|
||||
IFMarker=No
|
||||
OFMarkInt=Reject
|
||||
IFMarkInt=Reject
|
||||
|
||||
# ietadm --op show --tid=1 --sid=0x10000013d0200
|
||||
InitialR2T=No
|
||||
ImmediateData=Yes
|
||||
MaxConnections=1
|
||||
MaxRecvDataSegmentLength=262144
|
||||
MaxXmitDataSegmentLength=131072
|
||||
MaxBurstLength=2097152
|
||||
FirstBurstLength=262144
|
||||
DefaultTime2Wait=2
|
||||
DefaultTime2Retain=20
|
||||
MaxOutstandingR2T=1
|
||||
DataPDUInOrder=Yes
|
||||
DataSequenceInOrder=Yes
|
||||
ErrorRecoveryLevel=0
|
||||
HeaderDigest=None
|
||||
DataDigest=None
|
||||
OFMarker=No
|
||||
IFMarker=No
|
||||
OFMarkInt=Reject
|
||||
IFMarkInt=Reject
|
||||
|
||||
# tgtadm --op show --mode session --tid 1 --sid 1
|
||||
MaxRecvDataSegmentLength=2097152
|
||||
MaxXmitDataSegmentLength=131072
|
||||
HeaderDigest=None
|
||||
DataDigest=None
|
||||
InitialR2T=No
|
||||
MaxOutstandingR2T=1
|
||||
ImmediateData=Yes
|
||||
FirstBurstLength=262144
|
||||
MaxBurstLength=2097152
|
||||
DataPDUInOrder=Yes
|
||||
DataSequenceInOrder=Yes
|
||||
ErrorRecoveryLevel=0
|
||||
IFMarker=No
|
||||
OFMarker=No
|
||||
DefaultTime2Wait=2
|
||||
DefaultTime2Retain=0
|
||||
OFMarkInt=Reject
|
||||
IFMarkInt=Reject
|
||||
MaxConnections=1
|
||||
RDMAExtensions=No
|
||||
TargetRecvDataSegmentLength=262144
|
||||
InitiatorRecvDataSegmentLength=262144
|
||||
MaxOutstandingUnexpectedPDUs=0
|
||||
|
||||
Measured by Vladislav Bolkhovitin
|
||||
Reference in New Issue
Block a user