> -----Original Message----- > From: linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] > On Behalf Of Steven Whitehouse > > There is no harm in unmounting the cluster filesystem on all nodes and then mounting > it on exactly one node with lock_nolock to back it up. The only issue is that you have to > be very careful in the commands that you issue in order to be certain that it has not > been left accidentally mounted on one of the cluster nodes. The obvious downside is that the GFS volume cannot be used at all during the lock_nolock mount/backup. Using a SAN that supports LUN snapshots, there is another way to get a backup. You can: 1. Freeze the GFS volume 2. Create a snapshot 3. Unfreeze GFS 4. Mount the snapshot with lock_nolock 5. Perform a conventional backup of the mounted snapshot The first three steps should complete very quickly, minimizing downtime. Steps 4 and 5 are performed on the snapshot only and do not disrupt the original volume, nor does this result in increased dlm traffic. The only performance impact may be from increased block I/O from the SAN during the backup. -Jeff -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
