> -----Original Message----- > From: linux-cluster-bounces@xxxxxxxxxx > [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Gordan Bobic > Sent: Thursday, October 16, 2008 4:48 PM > To: linux clustering > Subject: Re: GFS Tunables > > Kevin Anderson wrote: > > On Thu, 2008-10-16 at 21:29 +0100, Gordan Bobic wrote: > >> Brandon Young wrote: > >> > >>> As for LVM snapshotting ... I am under the impression that those > >>> features are unavailable in GFS (and are slated for GFS2? > Which is > >>> not "production ready", yet?) It has certainly occured > to me to try > >>> that feature, if only it were available. Am I > misinformed? Perhaps > >>> I need some more education on how exactly LVM mirroring will help > >>> me. I am > >>> *attempting* to approximate a traditional backup scheme, > atleast on > >>> this particular filesystem. Am I correct in believing > that I could > >>> snapshot a volume (assuming the feature is available) and run a > >>> traditional backup (using, say, rdiff-backup) in a > shorter time than > >>> I can now, where I'm running it straight off a live GFS volume? > >> You can use CLVM (Cluser aware LVM) and create GFS on top of that > >> volume. You can them use CLVM to take a snapshot of the > block device, > >> mount it read-only with lock_nolock and back that up. That > should go > >> at non-clustered FS speeds. > >> > > We don't have support for cluster snapshots as of yet even > though it > > has been on the todo list for about 5 years now :(. > > Joy... My mistake. Sorry I mentioned it. > How about snapshotting at the backend storage device? We usually use linux as the backed, hand out storage via iscsi and snapshot at the backend - this eliminates the need for doing snaps at the GFS level - I agree that if there was snapshotting at the LVM/GFS level we could get a clean snapshot.... another problem.. > Gordan > > -- > 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
