From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars Marowsky-Bree Subject: Re: Should multipath detect changed path UIDs? Date: Wed, 26 Jan 2005 23:13:54 +0100 Message-ID: <20050126221354.GX5511@marowsky-bree.de> References: Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: device-mapper development List-Id: dm-devel.ids On 2005-01-26T16:50:50, "goggin, edward" wrote: > Possible solutions could involve (1) detecting fiber channel disconnect > hotplug events and acting upon them or (2) modifying multipath checker > functions to verify a path's UID remains consistent in addition to veri= fying > path connectivity. If you look at the emc_clariion checker in multipath-tools, you'll find it does that. I've this handy paper called "Developing Multipath Software for EMC CLARiiON Arrays" in front of me and believe that we implement it already, as far as possible. ;-) (There's one missing piece, it's handling the specific sense codes, but you'll find that they are already coded in dm-emc.c in the kernel, just disabled until we finally get the patch to get at the SCSI SENSE data in the bio struct. I need to pester axboe about it again.) Maybe you could add the Symmetrix specific handling to the emc_clariion path checker and the dm-emc.c kernel module? I'd be glad to make it more powerful than "just" the CX/AX arrays, alas, I "only" have a CX-500 for playing with ;-) Sincerely, Lars Marowsky-Br=E9e --=20 High Availability & Clustering SUSE Labs, Research and Development SUSE LINUX Products GmbH - A Novell Business -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel