From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick Mansfield Subject: Re: [patch for playing] Patch to support 4000 disks and maintain Date: Fri, 11 Apr 2003 11:12:32 -0700 Sender: linux-kernel-owner@vger.kernel.org Message-ID: <20030411111232.A7756@beaverton.ibm.com> References: <200304101339.49895.pbadari@us.ibm.com> <20030411154450.GW31739@ca-server1.us.oracle.com> <200304110928.32978.pbadari@us.ibm.com> <20030411175736.GY31739@ca-server1.us.oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20030411175736.GY31739@ca-server1.us.oracle.com>; from Joel.Becker@oracle.com on Fri, Apr 11, 2003 at 10:57:37AM -0700 To: Joel Becker Cc: Badari Pulavarty , Giuliano Pochini , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Mike Anderson List-Id: linux-scsi@vger.kernel.org On Fri, Apr 11, 2003 at 10:57:37AM -0700, Joel Becker wrote: > > Fortunately, the multipath solution Mike Anderson & Patrick Mansfield > > working on, colapses all the disks you see thro multiple paths into > > number of realdisks (4000). So you don't really need extra devices > > to support multipathing. > > Yes, but what if I want to see the multiple paths? Does their > solution allow you to specify the path behind the 'realdisk'? Does it > allow querying of the paths? > > Joel Seeing the path to disk relationship - yes (via proc for now, eventually via sysfs). Specifying from user space what path goes with what disk (explicitly): no, that might require user level scanning. Query a path - seeing and setting path states yes (via proc right now). Using sg with a specified path - no, but on the TODO list. I'm trying to pull the current multi-path patch up to 2.5.66 (ouch). The last functioning patch was against 2.5.59, some general info: http://www-124.ibm.com/storageio/multipath/scsi-multipath/index.php Or the patch: http://www-124.ibm.com/storageio/multipath/scsi-multipath/releases/2.5.59-mpath-1.patch.gz -- Patrick Mansfield