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Re: [linux-lvm] xfs_freeze & lvm2

Rich schrieb:
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 <http://www.tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html>.

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 gmx net

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