[linux-lvm] restoring filesystem state using snapshot

Ken Fuchs kfuchs at winternet.com
Thu Jan 8 17:22:02 UTC 2004

Kanika Nema wrote:

>i want to restore the filesystem state using only the snapshot taken by LVM 
>ie without taking a full backup.
>is this possible to do? i read all the lvm commands, but there is no command 
>to actually restore the entire filesystem back to the state it was in, when 
>the snapshot was taken.
>though the old files' state can be viewed using the snapshot volume, i want 
>to take the filesystem back to the prev state.
>Please tell me if this can be done. its urgent.

Will copying the contents of the snapshot over the original logical
volume do what you want?  If so, this can be done as follows:

# mount /dev/vg/snapshot /snap
# mount /dev/vg/original /orig
# (cd /snap; tar cf - .) | (cd /orig; tar xvf -)

Of course the v option on the second tar invocation can be omitted to
avoid seeing all the filenames of the files being copied.


Ken Fuchs <kfuchs at winternet.com>

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