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120 lines
5.4 KiB
HTML
120 lines
5.4 KiB
HTML
<!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 http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="author" content="Daniel Fernandes">
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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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<title>SCST vs LIO/TCM</title>
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</head>
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<body>
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<!-- wrap starts here -->
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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>
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<div id="menu">
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<ul>
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<li><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 id="current"><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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</div>
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<div id="content-wrap">
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<div id="sidebar">
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<h1>Comparison</h1>
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<ul class="sidemenu">
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<li><a href="comparison.html">Features comparison</a></li>
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<li><a href="scstvslio.html">SCST vs LIO/TCM</a></li>
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<li><a href="scstvsstgt.html">SCST vs STGT</a></li>
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<li><a href="mc_s.html">MC/S vs MPIO</a></li>
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</ul>
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</div>
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<div id="main">
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<h1>SCST vs LIO/TCM</h1>
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<p><a href="http://linux-iscsi.org/" rel="nofollow">LIO</a>,
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from recently being renamed to TCM, is another independent from SCST implementation
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of SCSI target framework for Linux. It's started as PyX iSCSI target and then was
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accommodated to other transports. But it's still in many kinds iSCSI-oriented.
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You can find an example when people are not happy with it
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<a href="http://thread.gmane.org/gmane.linux.scsi/65703/focus=66749">here</a>.</p>
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<p>LIO maintainer, Nicholas Bellinger, is very good in building personal relationships and promoting LIO,
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although often using misleading half, less-then-half and simply deceitful statements
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about LIO current state, capabilities and future directions as well as about its competitor, SCST.
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For instance, he setup LIO targets comparison page with obviously wrong statements about SCST, like
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that it isn't fully zero copy or it isn't a generic target engine (while LIO, of course, is fully
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zero-copy and fully generic target engine). Any
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<a href="http://sourceforge.net/mailarchive/message.php?msg_id=21741080">attempts</a>
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to correct it were simply ignored.</p>
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<p>With those tricks Nicholas Bellinger was capable to attract key Linux kernel developers, and
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they suddenly changed their opinion about Linux SCSI target subsystem in the opposite direction.
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They previously asserted that
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in-kernel SCSI target is the wrong direction, SCSI target must be in the user space, so
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STGT is what everybody needed. Now their opinion is that SCSI target driver should be in the kernel space
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and the only target good for them is LIO, doesn't matter that:</p>
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<ol>
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<li><span>SCST is a lot more mature and advanced</span></li>
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<li><span>SCST from the beginning is a generic SCSI target</span></li>
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<li><span>SCST has a lot more features</span></li>
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<li><span>SCST has better performance</span></li>
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<li><span>SCST has a lot more users</span></li>
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<li><span>SCST has much bigger community</span></li>
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</ol>
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<p>So, rejecting base principles of the Linux kernel community that the best code should win, the worst
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code was chosen.</p>
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<p>You can find more background behind choosing LIO as the mainline kernel SCSI target
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subsystem if you read <a href="http://thread.gmane.org/gmane.linux.kernel/1078109/focus=1078310">this thread</a>
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as well as searching for targets related topics in Linux kernel and Linux SCSI mailing lists.</p>
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<p>Particularly notable is that James Bottomley from the beginning was telling that SCST
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can't be merged in the mainline kernel, because it doesn't offer a drop in replacement for STGT
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to avoid having 2 target infrastructures in the kernel at the same time. But, since LIO can't
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offer user space backend drivers and doesn't have ibmvstgt driver analog, for LIO the drop in replacement wasn't
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a requirement, so 2.6.38+ kernels successfully have both STGT and LIO.</p>
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</div>
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</div>
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</div>
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<p>© Copyright 2004 - 2021 <b><font color="#EC981F">Vladislav Bolkhovitin, Bart Van Assche & others</font></b>
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Design by: <b><font color="#EC981F">Daniel Fernandes</font></b> </p>
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