[linux-lvm] File-system uuid on LVM snapshot
zkabelac at redhat.com
Thu Jun 5 09:19:51 UTC 2014
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)
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