[linux-lvm] xfs_freeze & lvm2
klaus.strebel at gmx.net
Tue Oct 18 12:06:54 UTC 2005
> i am not subscribed, so i would be thankful if i could get a reply with
> cc. thanks.
> i tried making snapshots of xfs filesystem on lvm2. if xfs was frozen,
> lvcreate stopped at
> Suspending space-data
> dm suspend space-data N
> issuing xfs_freeze -u allowed the process to continue.
> in this list, Thu, 09 Jun 2005 Klaus Strebel wrote :
> "with LVM2 the XFS filesystem is 'frozen' automaticly on the mount
> -onouuid,ro ( not quite sure, but probably also for LVM1 ..., think it's
> in the XFS code ).
> So, forget xfs_freeze."
> as i understand it, consistent copy is created when lvcreate is issued,
> not when snapshot volume is mounted - is this right ?
As i understood things, no. Mounttime matters ;-) see
<http://www.tldp.org/HOWTO/LVM-HOWTO/snapshotintro.html> and as example
> if so, shouldn't filesystem also be frozen when a snapshot volume is
> created ?
... see above ...
> if it actually is done together with snapshot, does this mean that i
> really can forget about xfs_freeze and just create snapshots ?
> must i specify ro in mount options or is this optional ?
Well, if i'm wrong ( and to be honest, i didn't play around with all the
stuff for 1 1/2 years now :-( ) somebody might correct me, but if i
remember postings from linux-xfs mailing list, rw-snapshots with XFS is
not quite unstable ...
Klaus Strebel, Dipl.-Inform. (FH), mailto:klaus.strebel at gmx.net
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