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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@976 d57e44dd-8a1f-0410-8b47-8ef2f437770f
127 lines
5.7 KiB
HTML
127 lines
5.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta name="Keywords" content="Generic SCSI Target Subsystem for Linux" />
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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>SCSI Targets Comparison History</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/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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</ul>
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</div>
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<!-- content-wrap starts here -->
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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="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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<h3>Some background history of the <a href="comparison.html">Features comparison</a> page.</h3>
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<p>LIO was the first who has had similar comparison
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<script type="text/javascript">
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document.write("<a href=\"ht");
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document.write("tp://www.linux-is");
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document.write("csi.org/index.php/Main_Page#Feature_Overview\">page<\/a>");
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</script>
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<noscript>page http://www.linux-iscsi.org/index.php/Main_Page</noscript>. It was and still is very much
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wrong about SCST. I asked that page author, Nicholas Bellinger, to
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correct the wrong items (see <a href="http://sourceforge.net/mailarchive/forum.php?thread_name=49AECE0B.5030009%40vlnb.net&forum_name=scst-devel">my
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e-mail</a>), but Nicholas Bellinger refused to do it without any explanations. Moreover, he
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blocked my access to the LIO mailing list, preventing me from telling that
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to the interested people myself. After all our previous discussions and
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with his skills and experience it's nearly impossible to believe that Nicholas Bellinger
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didn't know that SCST is a lot more generic than LIO and has zero-copy
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in all the same places, where LIO has. Thus, that comparison page is looking like rather a deliberate cheating
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attempt. Seems SCST is so much superior over LIO, so Nicholas Bellinger gave up technical discussions and started
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attacking people's perception about SCST, trying to inspire them the opposite.</p>
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<h4>Update</h4>
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<p>After our comparison page was published, Nicholas Bellinger corrected in his comparison page the most crying items about SCST. Namely:
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he acknowledged that SCST is a generic engine as well as marked "zero-copy" item for SCST as "Needs kernel patch" and removed "User Interface" item.
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But "zero-copy" mark for SCST is still wrong, because
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SCST needs kernel patch to provide send zero-copy in the iSCSI target driver (and only in it) only if it is working with user space backend. LIO doesn't
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support user space backend, so, if it has "X" in this line, SCST must also have unconditional "X" there.</p>
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<p>Moreover, new wrong items where introduced:
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<ul>
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<li><span>SCST was marked as "-" in "Additional Header Segment" and "Bidirectional Commands" items.
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SCST and iSCSI-SCST support bidirectional commands as well as iSCSI-SCST supports other values in the
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Additional Header Segment (namely, extended CDB).</span></li>
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<li><span>STGT marked as having Fibre Channel target drivers for Emulex, QLogic and LSI adapters. Where are they?</span></li>
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<li><span>STGT marked as having Fibre Channel QLogic target driver in-tree. Which tree is meant?</span></li>
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<li><span>STGT marked as supporting SAS and parallel SCSI targets. But
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it fundamentally can't do that. Those transports don't provide expecting
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transfers values (size and direction), so those values must be extracted
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directly from CDBs. STGT doesn't have the necessary infrastructure for that, see, for instance,
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<a href="https://lists.berlios.de/pipermail/stgt-devel/2007-March/000436.html">"https://lists.berlios.de/pipermail/stgt-devel/2007-March/000436.html</a>.
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Nothing has changed since time, when that e-mail was sent.
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</ul>
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<p>Interesting coincidence that the above wrong STGT items were added at nearly the same time as LIO started working with STGT's in-kernel target drivers...</p>
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</p>
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</div>
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</div>
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</div>
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<!-- wrap ends here -->
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<!-- footer starts here -->
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<div id="footer">
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<p>
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© Copyright 2004-2009 <b><font color="#EC981F">Vladislav Bolkhovitin & others.</font>
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Design by: <b><font color="#EC981F">Daniel Fernandes</font></b>
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</p>
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</div>
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</body>
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