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| <h2 id=slogan>Generic SCSI Target Subsystem for Linux</h2> |
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| <h1>Comparison</h1> |
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| <h1>SCST vs STGT</h1> |
| <p><a href="http://stgt.sourceforge.net/">STGT</a> is alternative, independent from SCST implementation |
| of SCSI target framework for Linux. It has different architecture, where SCSI target state machine is placed in |
| the user space, while in SCST all the processing done in the kernel. Such architecture as STGT has was acknowledged |
| by the Linux SCSI subsystem maintainers as a "right" one, so kernel's part of STGT quickly |
| found its way to the kernel.</p> |
| |
| <p>But such architecture has several inherent problems. Among them performance and complexity. |
| See <a href="http://lkml.org/lkml/2008/12/10/245">description</a> for the set of patches, submitted for |
| the first iteration of in-kernel inclusion review and comments in Linux kernel mailing list.</p> |
| |
| <p>See also the following important discussions:</p> |
| <ul> |
| |
| <li><span><a href="http://news.gmane.org/find-root.php?message_id=%3ce2e108260801170127w2937b2afg9bef324efa945e43%40mail.gmail.com%3e"> |
| "Performance of SCST versus STGT"</a> for performance comparison.</span></li> |
| |
| <li><span><a href="http://news.gmane.org/find-root.php?message_id=%3c463F36AC.3010207%40vlnb.net%3e"> |
| "Question for pass-through target design"</a></span></li> |
| |
| <li><span><a href="http://news.gmane.org/find-root.php?message_id=%3c43987F75.2000301%40vlnb.net%3e"> |
| "Stgt a new version of iscsi target?"</a>, especially pay attention to |
| <a href="http://article.gmane.org/gmane.linux.scsi/21073">this</a> message why STGT's architecture was considered "right". |
| </span></li> |
| |
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| |
| <p>Time has proved that STGT is too weak to satisfy modern storage requirements. Now it is obsolete and |
| soon going to be removed from the mainline kernel.</p> |
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