From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lars Marowsky-Bree Subject: Re: [RFC] Multi-path IO in 2.5/2.6 ? Date: Tue, 10 Sep 2002 15:04:27 +0200 Sender: linux-kernel-owner@vger.kernel.org Message-ID: <20020910130427.GP2992@marowsky-bree.de> References: <200209091734.g89HY5p11796@localhost.localdomain> <20020909170847.A24352@eng2.beaverton.ibm.com> <10209100055.ZM65139@classic.engr.sgi.com> 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: <10209100055.ZM65139@classic.engr.sgi.com> To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org List-Id: linux-scsi@vger.kernel.org On 2002-09-10T00:55:58, Jeremy Higdon said: > Is there any plan to do something for hardware RAIDs in which two dif= ferent > RAID controllers can get to the same logical unit, but you pay a perf= ormance > penalty when you access the lun via both controllers?=20 This is implemented in the md multipath patch in 2.4; it distinguishes = between "active" and "spare" paths. The LVM1 patch also does this by having priorities for each path and on= ly going to the next priority group if all paths in the current one have f= ailed, which IMHO is slightly over the top but there is always someone who mig= ht need it ;-) This functionality is a generic requirement IMHO. Sincerely, Lars Marowsky-Br=E9e --=20 Immortality is an adequate definition of high availability for me. --- Gregory F. Pfister