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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@250 d57e44dd-8a1f-0410-8b47-8ef2f437770f
54 lines
2.9 KiB
HTML
54 lines
2.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<html>
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<head>
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<meta http-equiv="content-type"
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content="text/html; charset=ISO-8859-1">
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<title>SCST: Generic SCSI Target Middle Level for Linux</title>
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<meta name="Keywords"
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content="SCST, Linux, SCSI target, Qlogic, QLA2200, QLA2300, iSCSI, SCSI">
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</head>
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<body>
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<a href="http://stgt.berlios.de/">STGT</a> is alternative, independent
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from SCST implementation of SCSI target framework for Linux. It has
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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.
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Such architecture was acknowledged as a "right" one by the Linux SCSI
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subsystem maintainers, so kernel's part of STGT quickly found its way
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to the kernel. But such architecture has two inherent problems, namely
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performance and complexity. See this thread: <a
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href="http://sourceforge.net/mailarchive/forum.php?thread_name=472F7FA4.7040303%40wpkg.org&forum_name=scst-devel">http://sourceforge.net/mailarchive/forum.php?thread_name=472F7FA4.7040303%40wpkg.org&forum_name=scst-devel</a>
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and this message: <a
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href="http://thread.gmane.org/gmane.linux.scsi/36417/focus=37273">http://thread.gmane.org/gmane.linux.scsi/36417/focus=37273</a>
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for more details.<br>
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<br>
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See also the following important discussions:<br>
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<ul>
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<li><a
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href="http://news.gmane.org/find-root.php?message_id=%3c43987F75.2000301%40vlnb.net%3e">http://news.gmane.org/find-root.php?message_id=%3c43987F75.2000301%40vlnb.net%3e</a>,
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especially pay attention to this message: <a
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href="http://article.gmane.org/gmane.linux.scsi/21073">http://article.gmane.org/gmane.linux.scsi/21073</a>
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for motivation behind considering STGT's architecture "right".</li>
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<li><a
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href="http://news.gmane.org/find-root.php?message_id=%3c463F36AC.3010207%40vlnb.net%3e">http://news.gmane.org/find-root.php?message_id=%3c463F36AC.3010207%40vlnb.net%3e</a></li>
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<li><a
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href="http://news.gmane.org/find-root.php?message_id=%3ce2e108260801170127w2937b2afg9bef324efa945e43%40mail.gmail.com%3e">http://news.gmane.org/find-root.php?message_id=%3ce2e108260801170127w2937b2afg9bef324efa945e43%40mail.gmail.com%3e</a>
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for performance comparison.<br>
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</li>
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</ul>
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Also you shouldn't be deceived by the fact
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that some (small) part of STGT was accepted in the kernel. It doesn't
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mean that STGT has the "kernel quality". In fact, STGT as a whole
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similarly to any other out-of-tree project lives on its own, hence has
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its own quality level, which isn't necessary better, than the quality
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level of SCST. Actually, from such important aspect of quality as
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simplicity, it might be quite contrary: e.g. SCST isn't required to
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support HIGHMEM (nowadays it isn't necessary, but required for all
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in-kernel components), which allowed to simplify memory management a
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lot.<br>
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<br>
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<hr style="width: 100%; height: 1px;"><a href="main.html">Main</a> <a
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href="index.html">Index</a><br>
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<br>
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</body>
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</html>
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