From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id i79HJua29466 for ; Mon, 9 Aug 2004 13:19:56 -0400 Received: from jinx.internetstaff.com (jinx.internetstaff.com [63.214.174.240]) by mx1.redhat.com (8.12.10/8.12.10) with ESMTP id i79HJte1031835 for ; Mon, 9 Aug 2004 13:19:55 -0400 Received: from localhost (localhost [127.0.0.1]) by jinx.internetstaff.com (Postfix) with ESMTP id 16C324BC221 for ; Mon, 9 Aug 2004 10:19:55 -0700 (MST) Received: from jinx.internetstaff.com ([127.0.0.1]) by localhost (jinx [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 04485-01-26 for ; Mon, 9 Aug 2004 10:19:53 -0700 (MST) Received: from [10.10.3.135] (unknown [65.161.175.218]) by jinx.internetstaff.com (Postfix) with ESMTP id ADE2D4BC0B4 for ; Mon, 9 Aug 2004 10:19:53 -0700 (MST) Subject: Re: [linux-lvm] SAN Storage/mirror/lvm From: Cott Lang Message-Id: <1092071992.3369.48.camel@localhost> Mime-Version: 1.0 Date: Mon, 09 Aug 2004 10:19:53 -0700 Content-Transfer-Encoding: 7bit Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-lvm@redhat.com >I setup a similar system on a HDS-9570 but with only one >card in each machine - 'assuming' that the failover in the >driver would cope if a controller on the HDS failed (as >opposed to a QLogic failure) > >This worked fine if I disconncected a path in the fabric but >when we took a controller of line the failover failed. > >Since then I have used md multipath which has tested fine I have a similar issue, two storage processors, two HBAs, and redundant paths between them. On the host, I see 4 SCSI devices, two valid, two invalid - I'm guessing this is caused because only one storage processor exports a particular LUN, so half the paths are invalid until a storage processor fails over. sdd - SP A Path 1 sde - SP B Path 1 sdf - SP A Path 2 sdg - SP B Path 2 I have a LUN currently on SP B, so I can use md multipath configured with /dev/sde and /dev/sdg, and that seems to work. However, two things: 1) How do I set this up to handle a failover to SP A? 2) Multipath only seems to work in failover mode, is there a way to load balance across the two paths? Anyone have any hints? :)