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100 lines
4.3 KiB
HTML
100 lines
4.3 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 name="Keywords" content="SCST vs STGT">
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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 STGT</title>
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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>
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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="https://github.com/SCST-project/scst">Main</a></li>
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<li><a href="https://github.com/SCST-project/scst/releases">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 STGT</h1>
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<p><a href="http://stgt.sourceforge.net/">STGT</a> is alternative, independent from SCST implementation
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of SCSI target framework for Linux. It has different architecture, where SCSI target state machine is placed in
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the user space, while in SCST all the processing done in the kernel. Such architecture as STGT has was acknowledged
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by the Linux SCSI subsystem maintainers as a "right" one, so kernel's part of STGT quickly
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found its way to the kernel.</p>
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<p>But such architecture has several inherent problems. Among them performance and complexity.
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See <a href="http://lkml.org/lkml/2008/12/10/245">description</a> for the set of patches, submitted for
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the first iteration of in-kernel inclusion review and comments in Linux kernel mailing list.</p>
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<p>See also the following important discussions:</p>
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<ul>
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<li><span><a href="http://news.gmane.org/find-root.php?message_id=%3ce2e108260801170127w2937b2afg9bef324efa945e43%40mail.gmail.com%3e">
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"Performance of SCST versus STGT"</a> for performance comparison.</span></li>
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<li><span><a href="http://news.gmane.org/find-root.php?message_id=%3c463F36AC.3010207%40vlnb.net%3e">
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"Question for pass-through target design"</a></span></li>
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<li><span><a href="http://news.gmane.org/find-root.php?message_id=%3c43987F75.2000301%40vlnb.net%3e">
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"Stgt a new version of iscsi target?"</a>, especially pay attention to
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<a href="http://article.gmane.org/gmane.linux.scsi/21073">this</a> message why STGT's architecture was considered "right".
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</span></li>
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</ul>
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<p>Time has proved that STGT is too weak to satisfy modern storage requirements. Now it is obsolete and
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soon going to be removed from the mainline kernel.</p>
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</div>
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</div>
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</div>
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<div id="footer">
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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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