From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from agk.fab.redhat.com (agk.fab.redhat.com [10.33.0.19]) by pobox.fab.redhat.com (8.13.1/8.13.1) with ESMTP id l77LYCDd009022 for ; Tue, 7 Aug 2007 17:34:12 -0400 Received: from agk by agk.fab.redhat.com with local (Exim 4.34) id 1IIWgu-0006Sz-EE for linux-lvm@redhat.com; Tue, 07 Aug 2007 22:34:12 +0100 Date: Tue, 7 Aug 2007 22:34:12 +0100 From: Alasdair G Kergon Subject: Re: [linux-lvm] Best practice: metadata backup Message-ID: <20070807213412.GC2064@agk.fab.redhat.com> References: <20070807190153.GV2064@agk.fab.redhat.com> Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: 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" Content-Transfer-Encoding: 7bit To: LVM general discussion and development On Tue, Aug 07, 2007 at 04:56:01PM -0400, Stuart D. Gathman wrote: > I meant metadata backups. AIX keeps a copy on each physical volume > (using quorum to ensure a majority of the copies agree). I was wondering > how linux LVM would handle metadata backup on an all LVM system. Seems > like you would still need a small non LVM filesystem just for that. The backups in /etc/lvm are backups in case you lost or overwrote the metadata accidentally. There are already copies (and backups of previous copies) on each physical volume (in the default configuration) and there's an automated process to deal with simple problems like power failure during a metadata update leading to disagreement between the copies. Alasdair -- agk@redhat.com