From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Mon, 07 Aug 2006 05:56:17 -0700 (PDT) Received: from outfbmx008.isp.belgacom.be (outfbmx008.isp.belgacom.be [195.238.5.105]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id k77Cu1DW026545 for ; Mon, 7 Aug 2006 05:56:02 -0700 Received: from outmx009.isp.belgacom.be (outmx009.isp.belgacom.be [195.238.5.4]) by outfbmx008.isp.belgacom.be (Postfix) with ESMTP id 72FC639937 for ; Mon, 7 Aug 2006 13:02:19 +0200 (CEST) Received: from outmx009.isp.belgacom.be (localhost [127.0.0.1]) by outmx009.isp.belgacom.be (8.12.11.20060308/8.12.11/Skynet-OUT-2.22) with ESMTP id k77B1ndr024944 for ; Mon, 7 Aug 2006 13:01:49 +0200 (envelope-from ) Message-ID: <44D71DA2.2020409@skynet.be> Date: Mon, 07 Aug 2006 13:01:54 +0200 From: kris buggenhout MIME-Version: 1.0 Subject: Re: Concurrent mount of XFS over SAN References: <44D26D3E.5010708@exegy.com> <20060807084830.58133.qmail@web31713.mail.mud.yahoo.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: xfs-bounce@oss.sgi.com Errors-To: xfs-bounce@oss.sgi.com List-Id: xfs To: Jan-Frode Myklebust Cc: linux-xfs@oss.sgi.com afaik, the node was stored in xlv, which was an extra option in IRIX, ( extra license) but this could later be used in CXFS which allows multiple machines to mount the same FS read write from a SAN, made for clusters, HA and HPC... knowledge of the node "owning" the device was in there for protection. but can be overridden with an xlv command. kind regards, Kris Jan-Frode Myklebust wrote: > On 2006-08-07, Heilige Gheist wrote: > >> It's obvious that I can always fall back to the inter-node heart-beat >> to ensure that only one node is mounting the filesystem. >> I'm just wondering if there's any facility or accepted practice to >> enforce it. >> > > STONITH (Shoot The Other Node In The Head) trough smart power switches > or management adapters in the node. > > SCSI reserve/release ... No idea how reliable this is on a SAN, but the > ServeRAID-version works great. http://www.linux-ha.org/ServeRAID > > Export the volume group, or scsi device on the first node, before > importing/attaching it on the second .. Probably best to use together > with STONITH, in case the first node fails on unmounting/exporting. > > BTW: I think XFS on IRIX had the owning node name in the file system header, > and only would allow this node to mount the fs. But I can't find this now... > Maybe it's gone, or maybe it was in xlv.. ? > > > -jf > > > > >