mirror of
https://github.com/SCST-project/scst.git
synced 2026-05-23 21:51:27 +00:00
d7e6569b1a
svn+ssh://yanb123@svn.code.sf.net/p/scst/svn/trunk
........
r5667 | bvassche | 2014-07-08 18:11:58 +0300 (Tue, 08 Jul 2014) | 1 line
nightly build: Update kernel versions
........
r5668 | vlnb | 2014-07-10 04:00:29 +0300 (Thu, 10 Jul 2014) | 3 lines
Make SCST interface compatibility more robust
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r5669 | bvassche | 2014-07-10 09:17:57 +0300 (Thu, 10 Jul 2014) | 1 line
scst/Makefile: Create /var/lib/scst/vdev_mode_pages while installing SCST
........
r5670 | bvassche | 2014-07-10 09:18:58 +0300 (Thu, 10 Jul 2014) | 1 line
scst.spec.in: Create /var/lib/scst/pr and /var/lib/scst/vdev_mode_pages when installing the SCST RPM
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r5672 | bvassche | 2014-07-10 15:29:59 +0300 (Thu, 10 Jul 2014) | 2 lines
scripts/rebuild-rhel-kernel-rpm: Move code for downloading a RHEL (clone) RPM into a separate file
........
r5673 | bvassche | 2014-07-11 09:48:49 +0300 (Fri, 11 Jul 2014) | 1 line
scripts/generate-kernel-patch: Also generate scst-itf-ver.h
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r5674 | bvassche | 2014-07-11 10:54:19 +0300 (Fri, 11 Jul 2014) | 1 line
scripts/generate-kernel-patch: Remove trailing whitespace
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r5675 | vlnb | 2014-07-12 03:53:46 +0300 (Sat, 12 Jul 2014) | 3 lines
BLOCKIO microoptimization: use per-device biosets
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r5676 | bvassche | 2014-07-13 10:15:05 +0300 (Sun, 13 Jul 2014) | 1 line
nightly build: Update kernel versions
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r5677 | vlnb | 2014-07-16 06:27:20 +0300 (Wed, 16 Jul 2014) | 3 lines
Install scst_itf_ver.h as well
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r5678 | bvassche | 2014-07-16 08:35:40 +0300 (Wed, 16 Jul 2014) | 1 line
scst-devel rpm: Include /usr/include/scst/scst_itf_ver.h
........
r5679 | bvassche | 2014-07-16 11:29:16 +0300 (Wed, 16 Jul 2014) | 6 lines
ib_srpt: Fix Mellanox OFED build
Use the proper include directory when building against Mellanox OFED.
Do not require to remove /lib/modules/$(KVER)/kernel/drivers/infiniband
before building ib_srpt.
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r5680 | bvassche | 2014-07-18 12:27:41 +0300 (Fri, 18 Jul 2014) | 1 line
srpt/Makefile: Remove a superfluous assignment statement
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r5681 | bvassche | 2014-07-18 12:28:22 +0300 (Fri, 18 Jul 2014) | 1 line
srpt/Makefile: SLES + Mellanox OFED build fix
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r5682 | bvassche | 2014-07-18 12:30:25 +0300 (Fri, 18 Jul 2014) | 1 line
srpt/README: Fix SLES patch instructions
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r5683 | vlnb | 2014-07-19 06:54:33 +0300 (Sat, 19 Jul 2014) | 11 lines
iscsi-scst: Handle data buffers with non-zero offset correctly
Start at the proper offset in the receive buffer if sg[0].offset != 0.
Return the proper data to the initiator if sg[0].offset != 0.
This patch reworks trunk r5281, "iscsi-scst: fix offset
calculation", February 13, 2014.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
........
r5684 | vlnb | 2014-07-19 07:08:30 +0300 (Sat, 19 Jul 2014) | 10 lines
scst: Clean up scst_process_active_cmd()
Since inside scst_process_active_cmd() cmd->state can only change after
cmd has been added back to the command list it is safe to perform the
cmd->state check without holding the command list lock. Hence move the
perform the cmd->state check without holding the command list lock.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5685 | vlnb | 2014-07-19 07:11:39 +0300 (Sat, 19 Jul 2014) | 7 lines
scst: Introduce scst_set_thr_cpu_mask()
This patch does not change any functionality.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5686 | vlnb | 2014-07-19 07:13:24 +0300 (Sat, 19 Jul 2014) | 8 lines
scst_vdisk: Micro-optimize the zero-copy check
Only evaluate the SCSI command type if virt_dev->zero_copy has been
set instead of always checking the SCSI command type.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5698 | bvassche | 2014-07-20 11:37:58 +0300 (Sun, 20 Jul 2014) | 1 line
nightly build: Update kernel versions
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r5700 | vlnb | 2014-07-22 02:04:18 +0300 (Tue, 22 Jul 2014) | 3 lines
Web updates
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r5701 | vlnb | 2014-07-22 03:22:06 +0300 (Tue, 22 Jul 2014) | 8 lines
scst: Make scst_cmd_threads.threads_list locking more fine-grained
Introduce a new synchronization object, namely scst_cmd_threads.thr_lock,
to protect scst_cmd_threads.threads_list.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
........
r5702 | vlnb | 2014-07-23 05:00:06 +0300 (Wed, 23 Jul 2014) | 7 lines
Prevent possible collisions between saved PR and mode pages backup files
From now on '.' is illegal character in SCST device names
Reported-by Ken Raeburn <raeburn@permabit.com>
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r5703 | vlnb | 2014-07-23 05:49:50 +0300 (Wed, 23 Jul 2014) | 5 lines
Review of host_status handling (pass-through mode)
Inspired by Dave Butler <tears.the@gmail.com> and Bart Van Assche <bvanassche@acm.org>
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r5704 | vlnb | 2014-07-26 03:04:51 +0300 (Sat, 26 Jul 2014) | 3 lines
Internal REQUEST SENSE: NO SENSE is also valid sense
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r5705 | vlnb | 2014-07-29 02:11:14 +0300 (Tue, 29 Jul 2014) | 3 lines
Print initiator and target in the abort messages
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r5706 | vlnb | 2014-07-30 05:27:10 +0300 (Wed, 30 Jul 2014) | 3 lines
Minor logging improvements
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r5707 | vlnb | 2014-07-30 05:52:26 +0300 (Wed, 30 Jul 2014) | 3 lines
Follow up for r5704: NO SENSE is also valid sense
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r5708 | vlnb | 2014-07-30 05:53:07 +0300 (Wed, 30 Jul 2014) | 3 lines
Minor fix
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r5709 | bvassche | 2014-08-06 20:40:30 +0300 (Wed, 06 Aug 2014) | 1 line
nightly build: Update kernel versions
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r5710 | bvassche | 2014-08-07 10:20:08 +0300 (Thu, 07 Aug 2014) | 1 line
RHEL 7: Add scst_exec_req_fifo and put_page_callback patches
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r5711 | bvassche | 2014-08-07 11:12:22 +0300 (Thu, 07 Aug 2014) | 1 line
Rename the two RHEL 7 scst_exec_req_fifo patches
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r5712 | bvassche | 2014-08-07 11:38:19 +0300 (Thu, 07 Aug 2014) | 1 line
scripts/rebuild-rhel-kernel-rpm: Add RHEL 7 support
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r5713 | bvassche | 2014-08-08 13:37:17 +0300 (Fri, 08 Aug 2014) | 1 line
nightly build: Update kernel versions
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r5714 | bvassche | 2014-08-09 14:02:19 +0300 (Sat, 09 Aug 2014) | 1 line
scripts/rebuild-rhel-kernel-rpm: Install more prerequisites
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r5715 | bvassche | 2014-08-15 10:49:07 +0300 (Fri, 15 Aug 2014) | 1 line
nightly build: Update kernel versions
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r5716 | vlnb | 2014-08-16 02:44:33 +0300 (Sat, 16 Aug 2014) | 3 lines
Fix blockio bioset for older kernels, which need explicit bio destructors
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r5717 | vlnb | 2014-08-20 00:52:31 +0300 (Wed, 20 Aug 2014) | 3 lines
Update for kernels 3.16
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r5718 | vlnb | 2014-08-20 05:24:08 +0300 (Wed, 20 Aug 2014) | 12 lines
Fix Coverity warning of q2t_ctio_to_cmd() dead code
Coverity warns that 'handle == Q2T_SKIP_HANDLE' can never occur, because
code preceding the test has masked out a handle bit that would be
required for the test to succeed.
Fix that by extending Q2T_SKIP_HANDLE to incorporate
CTIO_INTERMEDIATE_HANDLE_MARK as well.
Reported-by: Steven J. Magnani <steve@digidescorp.com>
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r5719 | bvassche | 2014-08-20 09:55:04 +0300 (Wed, 20 Aug 2014) | 1 line
nightly build: Add kernel 3.16 nightly build infrastructure
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r5720 | bvassche | 2014-08-20 09:57:04 +0300 (Wed, 20 Aug 2014) | 1 line
nightly build: Add kernel version 3.16.1
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r5721 | vlnb | 2014-08-21 08:17:47 +0300 (Thu, 21 Aug 2014) | 5 lines
Fix incorrect address computation during receive PDUs preparations
Found and fix suggested by Кирилл Тюшев <kirill.tyushev8@gmail.com>
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r5722 | vlnb | 2014-08-21 08:18:43 +0300 (Thu, 21 Aug 2014) | 3 lines
Integration of the QLogic git's qla2x00t into the SCST tree
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r5724 | bvassche | 2014-08-22 10:19:55 +0300 (Fri, 22 Aug 2014) | 9 lines
Fix a kernel 3.16 checkpatch complaint about trailing semicolons
Avoid that the checkpatch tool included in Linux kernel v3.16 reports the
following warning:
macros should not use a trailing semicolon
This patch does not change any functionality.
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r5725 | bvassche | 2014-08-25 14:36:33 +0300 (Mon, 25 Aug 2014) | 1 line
ib_srpt: Kernel v3.17 build fix
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r5726 | bvassche | 2014-08-25 14:41:55 +0300 (Mon, 25 Aug 2014) | 1 line
ib_srpt: Log QPN next to session name
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r5727 | bvassche | 2014-08-25 14:46:43 +0300 (Mon, 25 Aug 2014) | 6 lines
ib_srpt: Speed up kernel driver unloading after a cable pull
When unloading the ib_srpt kernel module, instead of waiting until
all connected queue pairs have left the TimeWait state, destroy
these queue pairs immediately.
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r5728 | bvassche | 2014-08-25 15:50:19 +0300 (Mon, 25 Aug 2014) | 8 lines
ib_srpt: Make the completion vector configurable
Allow a set of completion vectors to be associated with each InfiniBand
HCA port and allocate the completion vector for each session in a
round-robin fashion from the per-port set. This helps to spread the
InfiniBand interrupt workload over multiple CPU's, at least if different
InfiniBand MSI-X vectors are associated with different CPU's.
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r5729 | vlnb | 2014-08-26 06:21:07 +0300 (Tue, 26 Aug 2014) | 7 lines
scst_vdisk: Make vdisk_sup_vpd() easier to extend
This patch doesn't change any functionality.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5730 | vlnb | 2014-08-26 06:44:23 +0300 (Tue, 26 Aug 2014) | 12 lines
scst_vdisk: Make EUI-64 and NAA IDs configurable
Make the SCSI device identification page (83h) EUI-64 and NAA
IDs configurable. If neither the eui64_id nor the naa_id sysfs
attribute has been set, export the first eight bytes of the
t10_dev_id as an EUI-64 ID. If the NAA ID but not the EUI-64 ID
has been set, report the NAA ID only. If both IDs have been set,
report both.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5731 | bvassche | 2014-08-26 12:56:54 +0300 (Tue, 26 Aug 2014) | 1 line
scstadmin: Avoid that the Perl interpreter prints a warning message about using an undefined variable on Fedora systems
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r5732 | vlnb | 2014-08-27 05:41:40 +0300 (Wed, 27 Aug 2014) | 9 lines
iscsi-scst: Build fix for IPV6=n
Ensure that iscsi-scst builds properly against a kernel with CONFIG_IPV6=n.
Reported by Igor Novgorodov <igor@novg.net> on June 7, 2014.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5733 | vlnb | 2014-08-27 05:42:35 +0300 (Wed, 27 Aug 2014) | 9 lines
scst_pres: Make a few error messages more clear
Make it possible to figure out what went wrong from inspecting the
system log only by mentioning the incorrect filename in the system
log.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5734 | vlnb | 2014-08-27 05:43:50 +0300 (Wed, 27 Aug 2014) | 8 lines
scst: Remove set_cpus_allowed() invocations
Since scst.h contains a backport of the definition of set_cpus_allowed_ptr(),
the set_cpus_allowed() invocations are superfluous. Hence remove these.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5735 | vlnb | 2014-08-27 05:55:28 +0300 (Wed, 27 Aug 2014) | 8 lines
iscsi-scst: Micro-optimize cmnd_prepare_recv_pdu()
Instead of adding sg[idx].offset to addr and immediately subtracting
sg[idx].offset again, leave out both arithmetic operations.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
........
r5736 | vlnb | 2014-08-27 06:00:44 +0300 (Wed, 27 Aug 2014) | 5 lines
scst/include/scst.h: Document on_abort_cmd() further
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
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r5737 | bvassche | 2014-08-27 09:33:02 +0300 (Wed, 27 Aug 2014) | 1 line
scst_vdisk: Build fix for kernel 3.1.x
........
git-svn-id: http://svn.code.sf.net/p/scst/svn/branches/iser@5738 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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<title>SCST: A Generic SCSI Target Subsystem for Linux</title>
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<body>
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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 id="menu">
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<ul>
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<li id="current"><a href="index.html">Home</a></li>
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<li><a href="http://www.sourceforge.net/projects/scst">Main</a></li>
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<li><a href="http://sourceforge.net/news/?group_id=110471">News</a></li>
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<li><a href="targets.html">Drivers</a></li>
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<li><a href="downloads.html">Downloads</a></li>
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<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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<li><a href="solutions.html">Solutions</a></li>
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</ul>
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</div>
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<div id="content-wrap">
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<div id="main">
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<h1>Generic SCSI Target Subsystem for Linux</h1>
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<p>The generic SCSI target subsystem for Linux (SCST) allows creation of sophisticated storage devices
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from any Linux box. Those
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devices can provide advanced
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functionality, like replication, thin provisioning,
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deduplication, high availability,
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automatic backup, etc. Another class of such devices
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are Virtual Tape Libraries (VTL)
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as well as other disk-based backup solutions.</p>
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<p>SCST devices can use any link which supports
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SCSI-style data exchange: <strong>iSCSI</strong>, <strong>Fibre Channel</strong>, <strong>FCoE</strong>,
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<strong>SAS</strong>,
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<strong>InfiniBand (SRP)</strong>, <strong>Wide (parallel) SCSI</strong>, etc.</p>
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<p>It might
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well be that your favorite storage appliance is running SCST in the firmware.</p>
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<p>SCST project consists from a set of subprojects: generic SCSI target mid-layer itself (SCST core)
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with a set of device handlers as well as target drivers
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and user space utilities.
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<h1>Features of SCST Core</h1>
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<ul>
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<li><span>SCST core provides unified,
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consistent interface between SCSI target drivers and
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Linux kernel as well as between Linux kernel and storage backend
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handlers, connecting target drivers with real or emulated storage backend.</span></li>
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<li><span>SCST core performs all required pre- and post- processing of incoming requests as well as
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necessary error recovery.</span></li>
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<li><span>SCST core undertakes most problems, related to execution contexts, thus practically eliminating one of the most
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complicated problem in the kernel drivers development. For example, target drivers for Marvell
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SAS adapters or for InfiniBand SRP are less 3000 lines of code long.</span></li>
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<li><span>Very low overhead and fine-grained locks allow to reach the
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maximum performance and scalability. Particularly, incoming requests can be processed in
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the caller's context or in one of the internal SCST core's tasklets without any
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extra context switches.</span></li>
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<li><span>Device handlers architecture allows various I/O
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modes in backstorage handling. For example, pass-through device handlers allow to export real
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SCSI hardware and vdisk device handler allows to export files as virtual disks.</span></li>
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<li><span>Advanced per-initiator devices visibility management (LUN masking) allows different
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initiators to see different set of devices with different access permissions. For instance,
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initiator A could see exported from target T devices X and Y read-writable, and initiator B from
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the same target T could see devices Y read-only and Z read-writable.
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This feature is required for hardware targets, which don't have ability to create
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virtual targets (SAS adapters, for instance).</span></li>
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<li><span>SCST core emulates necessary functionality of SCSI host adapter, because from remote initiators' point of view
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a SCSI target acts as a SCSI host with its own devices. This is especially important in pass-through mode with
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one to many relationship, i.e. when multiple initiators can connect to the exported pass-through
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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>
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message in thread "Question for pass-through target design" in linux-scsi mailing list. Some of the emulated functions are the following:</span>
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<ul>
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<li><span>Generation of necessary UNIT ATTENTIONs, their storage and delivery to all connected
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remote initiators.</span></li>
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<li><span>RESERVE/RELEASE functionality.</span></li>
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<li><span>All types of RESETs and other task management functions.</span></li>
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<li><span>REPORT LUNS command as well as SCSI address space management in order to have consistent
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address space on all remote initiators, since local SCSI devices could not know about each
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other to report via REPORT LUNS command. Additionally, SCST core responds with error on all
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commands to non-existing devices and provides access control, so different remote
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initiators could see different set of devices.</span></li>
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<li><span>Other necessary functionality (task attributes, etc.) as specified in SCSI standards.</span></li>
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</ul>
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</li>
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<li><span>SCST core has multithreaded design and complete SMP support, so, if necessary, all your CPU cores will participate in the commands
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processing.</span></li>
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<li><span>Well documented.</span></li>
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</ul>
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<p>Interoperability between remote and local SCSI initiators (i.e. sd, st, etc.) is the additional issue that SCST is going to
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address (it is not implemented yet). It is necessary, because local SCSI initiators can change the state of the
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device, for example RESERVE the device, or some of its parameters and that could be done behind SCST, i.e. remote initiators
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will not know about it, which could
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lead to various problems, including data corruption. Thus, RESERVE/RELEASE commands, locally generated
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UNIT ATTENTIONs, etc. should be intercepted and passed through SCST core.</p>
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<p>You can find comparison of SCST with other SCSI targets on the <a href="comparison.html">Comparison</a> page.
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Some highlights what it can mean for end users you can find on the <a href="target_iscsi.html">iSCSI-SCST</a> page.
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<h1>SCST core supports the following I/O modes</h1>
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<ul>
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<li><span>Pass-through mode with one to many relationship, i.e. when multiple initiators can
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connect to the exported pass-through devices, for virtually all SCSI devices types: disks (type 0),
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tapes (type 1), processors (type 3), CDROMs (type 5), MO disks (type 7), medium changers (type 8) and RAID
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controllers (type 0xC). In this mode you can, for instance, share your parallel SCSI tape or SATA
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DVD-RW device to your iSCSI network.</span></li>
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<li><span>FILEIO mode, which allows to use files on file systems or block devices as virtual
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remotely available SCSI disks or CDROMs with benefits of the Linux cache.</span></li>
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<li><span>BLOCKIO mode, which performs direct block IO with a block device, bypassing
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page-cache for all operations. This mode works well with high-end storage HBAs and for applications that
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either do not need caching between application and disk or need the large block throughput.</span></li>
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<li><span>User space mode using scst_user device handler, which allows to implement in the
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user space high performance virtual SCSI devices. Comparing with fully in-kernel dev handlers
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this mode has very low overhead (few %%).</span></li>
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<li><span>Performance testing device handlers as well as NULLIO mode to provide
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a way for direct performance measurements without overhead of actual data
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transfers from/to underlying SCSI devices.
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</span></li>
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</ul>
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<h1>Certification</h1>
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<p>SCST core engine has passed VMware certification as part of
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<a href="http://scalecomputing.com/products">Scale’s Intelligent Clustered Storage</a> technology developed by
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<a href="http://scalecomputing.com">Scale Computing</a> as well as VMware and Microsoft certification as part of
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storage arrays developed by <a href="http://www.open-e.com/">Open-E, Inc</a> and
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<a href="http://www.starboardstorage.com">Starboard Storage</a>.</p>
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<p>As of October 2012 SCST-based Hewlett-Packard ProLiant BL465c Gen8 earned the maximum
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score 59.99@62 tiles in <a href="http://www.vmware.com/a/vmmark">VMmark Version 2.1.1</a>.</p>
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</div>
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<div id="rightbar">
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<h1>Documentation</h1>
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<p><a href="scst_pg.html">HTML</a></p>
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<p><a href="scst_pg.pdf">PDF</a></p>
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<p><a href="http://monklinux.blogspot.com/2012/02/scst-configuration-how-to-using-gentoo.html">Gentoo HOWTO</a></p>
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<p><a href="iscsi-scst-howto.txt">HOWTO For iSCSI-SCST</a></p>
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<p><a href="SCST_Gentoo_HOWTO.txt">Gentoo HOWTO For iSCSI-SCST</a></p>
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<p><a href="qla2x00t-howto.html">HOWTO For QLogic Target Driver</a></p>
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<p><a href="sgv_cache.html">SCST SGV Cache Description</a></p>
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<h1>Articles</h1>
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<p>By Marc Smith:</p>
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<p><a href="http://marcitland.blogspot.com/2011/03/accelerating-vdi-using-scst-and-ssds.html">Accelerating VDI Using SCST and SSDs</a></p>
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<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>
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<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>
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<h1>SCST 0.9.6 graphs</h1>
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<p><a href="images/init_scst.png">init_scst</a></p>
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<p><a href="images/scst_cmd_thread.png">scst_cmd_thread</a></p>
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<p><a href="images/scst_mgmt_cmd_thread.png">scst_mgmt_cmd_thread</a></p>
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<p><a href="images/scst_mgmt_thread.png">scst_mgmt_thread</a></p>
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<p>all by Ming Zhang</p>
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<h1>QUESTIONS</h1>
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<p>If you have any questions you can ask them via<br><a href="http://lists.sourceforge.net/lists/listinfo/scst-devel">
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scst-devel mailing list</a><br><br>
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See <a href="http://sourceforge.net/mail/?group_id=110471">mailing lists page</a> for more info about SCST mailing
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lists.</p>
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<h1></h1>
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<p><a href="http://sourceforge.net/donate/index.php?group_id=110471">
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<img src="http://images.sourceforge.net/images/project-support.jpg" width="88" height="32" border="0" alt="Support This Project"> </a></p>
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<h1></h1>
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