Thanks Zdenek for the quick reply. We are using thin volumes and thin snapshot, but we need all or most snapshots active. Therefore we are enabling the snapshot by-default. As you suggested we can have a workaround to mount those snapshot volumes by using 'nouuid' option. But the problem is in most of our use case the origin volume is mounted using the /etc/fstab. And here the mount entry is made using UUID. So in some cases instead of Origin volume the snapshot volume get mounted. Thanks & Regards, Rajesh ----- Original Message ----- > From: "Zdenek Kabelac" <zkabelac@redhat.com> > To: linux-lvm@redhat.com > Sent: Thursday, June 5, 2014 2:49:51 PM > Subject: Re: File-system uuid on LVM snapshot > > Dne 5.6.2014 10:26, Rajesh Joseph napsal(a): > > Hi all, > > > > Origin volume and snapshot volume share the same file-system UUID. So after > > the snapshot we fix the uuid by running xfs_admin or tune2fs. > > Do you have any recommendation or best practice in this regard? > > > > > With thin pools and thin volumes - snapshot of thin volume is now created > 'inactive' and it's skipped from default activation (you could always > override skip with -K i.e. : lvchange -ay -K vg/mythinsnap) > > So with thins you should mostly have only a single volume active with the FS > UUID. If you happen to have multiple volumes active and you need to mount > xfs > filesystem - use 'nouuid' (and eventually norecovery for read-only > activated snapshots) mount options. > > For old-snapshosts - all volumes need to be available/active - so you need to > use 'nouuid' option always. > > I don't see much point in changing FS UUID on your snapshot - unless of > course you plan to use snapshots as different volumes with just a 'single' > starting point (i.e. preinstalled tree of files) > > Regards > > Zdenek > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
