From owner-svn-doc-all@freebsd.org Sat Oct 17 21:08:48 2015 Return-Path: Delivered-To: svn-doc-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0D54FA173CE; Sat, 17 Oct 2015 21:08:48 +0000 (UTC) (envelope-from bjk@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id B03FB9D9; Sat, 17 Oct 2015 21:08:47 +0000 (UTC) (envelope-from bjk@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id t9HL8kPF085973; Sat, 17 Oct 2015 21:08:46 GMT (envelope-from bjk@FreeBSD.org) Received: (from bjk@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id t9HL8kcA085972; Sat, 17 Oct 2015 21:08:46 GMT (envelope-from bjk@FreeBSD.org) Message-Id: <201510172108.t9HL8kcA085972@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: bjk set sender to bjk@FreeBSD.org using -f From: Benjamin Kaduk Date: Sat, 17 Oct 2015 21:08:46 +0000 (UTC) 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 X-SVN-Group: doc-head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-doc-all@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: "SVN commit messages for the entire doc trees \(except for " user" , " projects" , and " translations" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Oct 2015 21:08:48 -0000 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 @@ + + High Availability clustering in CTL + + + + + Alexander + Motin + + mav@FreeBSD.org + + + + +

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.

+ +

This code supports dual-node HA with Asynchronous LUN Unit + Access (ALUA) in four modes:

+ +
    +
  • Active/Unavailable without interlink between nodes, where + the secondary node can report nothing except its presence.
    • +
  • Active/Standby with secondary node handling only basic LUN + discovery and reservation, synchronizing state and command + execution with the primary node through the interlink.
    • +
  • Active/Active with both nodes processing commands and + accessing the backing storage, synchronizing state and command + execution with the primary node through the interlink.
    • +
  • 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.
    • +
+ +

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.

+ +

CTL also got a large number of other improvements, including + support for emulation of CD/DVD drives and removable disks, + live LUN reconfiguration, etc.

+ +

The code is committed to &os; head and was recently merged to + stable/10 branch. +

+ + + + iXsystems, Inc. + + +