Date: Sat, 17 Oct 2015 21:08:46 +0000 (UTC) From: Benjamin Kaduk <bjk@FreeBSD.org> To: doc-committers@freebsd.org, svn-doc-all@freebsd.org, svn-doc-head@freebsd.org Subject: svn commit: r47606 - head/en_US.ISO8859-1/htdocs/news/status Message-ID: <201510172108.t9HL8kcA085972@repo.freebsd.org>
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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>mav@FreeBSD.org</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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