Xavier, I do not think that I have to use CLVM with ext4 or XFS in a cluster. The ext4 or XFS filesystems will be on shared (FC) storage, but they will be presented as a filesystem resource i.e. accessible to only one cluster at a time, as they have to be. So, I believe that simple LVM will do and snapshots will be available. The question is about the coexistence of a snapshot and the cluster filesystem resource. For example, what will happen if the node that runs the resource and happen to have created and mounted a snapshot on it, fails? I need to integrate snapshots for backup and keep the system highly available during backup as well. Regards, Chris Jankowski -----Original Message----- From: linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Xavier Montagutelli Sent: Tuesday, 23 November 2010 21:18 To: linux clustering Subject: Re: RHEL 6 cluster filesystem resource and LVM snapshots On Tuesday 23 November 2010 07:13:56 Jankowski, Chris wrote: > Hi, > > I am preparing a build of a RHEL 6 cluster with a filesystem resource(s) > (ext4 or XFS). The customer would like to use LVM snapshots of the > filesystems for tape backup. Where will your filesystem resource be located ? In a cluster, it's usually on a shared storage, using *cluster* LVM. Are snapshots available now with CLVM ? It was not the case last time I read documentation, which is/was (?) a serious drawback. > The tape backup may take a few hours after > which the snapshot will be deleted. > > Questions: > > 1. > Is the filesystem resource compatible with using LVM snapshots? > > 2. > How can I reconcile the temporary existence of a snapshot with the notion > of the filesystem resource, which is all about having things permanently > mounted ? > > 3. > Would either ext4 or XFS be preferable for any reasons for use with > snapshots for backup? > > I'd appreciate your comments. > > Thanks and regards, > > Chris Jankowski > -- Xavier Montagutelli Tel : +33 (0)5 55 45 77 20 Service Commun Informatique Fax : +33 (0)5 55 45 75 95 Universite de Limoges 123, avenue Albert Thomas 87060 Limoges cedex -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
