svn commit: r47606 - head/en_US.ISO8859-1/htdocs/news/status
Benjamin Kaduk <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.cvs.doc |
|---|---|
| Message-ID | <[email protected]> |
Author: bjk
Date: Sat Oct 17 21:08:46 2015
New Revision: 47606
URL: https://svnweb.freebsd.org/changeset/doc/47606
Log:
Add CTL HA report from mav
Modified:
head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml
Modified: head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml
==============================================================================
--- head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml Sat Oct 17 19:19:43 2015 (r47605)
+++ head/en_US.ISO8859-1/htdocs/news/status/report-2015-07-2015-09.xml Sat Oct 17 21:08:46 2015 (r47606)
@@ -2299,4 +2299,60 @@
</help>
</project>
+ <project cat='proj'>
+ <title>High Availability clustering in CTL</title>
+
+ <contact>
+ <person>
+ <name>
+ <given>Alexander</given>
+ <common>Motin</common>
+ </name>
+ <email>[email protected]</email>
+ </person>
+ </contact>
+
+ <body>
+ <p>CAM Target Layer (CTL), when originally developed by
+ Copan/SGI, had support for High Availability clustering.
+ Unfortunately, significant portions of the HA code were never
+ published with the main body of the source code. Now, the missing
+ part has been reimplemented from scratch and fixed/improved.</p>
+
+ <p>This code supports dual-node HA with Asynchronous LUN Unit
+ Access (ALUA) in four modes:</p>
+
+ <ul>
+ <li>Active/Unavailable without interlink between nodes, where
+ the secondary node can report nothing except its presence.</li>
+ <li>Active/Standby with secondary node handling only basic LUN
+ discovery and reservation, synchronizing state and command
+ execution with the primary node through the interlink.</li>
+ <li>Active/Active with both nodes processing commands and
+ accessing the backing storage, synchronizing state and command
+ execution with the primary node through the interlink.</li>
+ <li>Active/Active with secondary node having no backing storage
+ access, but instead working as a proxy, transfering all commands
+ to the first node for execution through the interlink.</li>
+ </ul>
+
+ <p>In the case of lost interlink connectivity to primary node,
+ the secondary node falls into the Transitioning state, which is
+ like Unavailable and can't answer most requests, but makes the
+ initiator wait for recovery or cluster failover.</p>
+
+ <p>CTL also got a large number of other improvements, including
+ support for emulation of CD/DVD drives and removable disks,
+ live LUN reconfiguration, etc.</p>
+
+ <p>The code is committed to &os; head and was recently merged to
+ stable/10 branch.
+ </p>
+ </body>
+
+ <sponsor>
+ iXsystems, Inc.
+ </sponsor>
+ </project>
+
</report>
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