Hiya, I was wondering about how to restore/apply a LVM snapshot to the original partition. Looking at the archive, I can see it's advised to dump the snapshot content into a file and then dump that onto the original device after having removed the snapshot. What's wrong with: lvcreate -n lv -L1G vg ... mount /dev/vg/lv /x ... lvcreate -s -n lv_snap /dev/vg/lv ... mount /dev/vg/lv_snap /y Them to apply the snapshot: umount /x /y dd bs=4M < /dev/mapper/vg-lv_snap > /dev/mapper/vg-lv-real lvremote /dev/vg/lv_snap It's still not optimal as it writes the whole volume, but at least, I don't have to find a storage area big enough to hold an extra copy of the whole volume and it's faster. It seems to be working on a test on /dev/loop. Is there any circumstance (as long as there's only one snapshot of the volume) where it wouldn't work, or what would be the potential pitfalls (other than if there's a crash in the middle, you're screwed)? Is there any plan to add the feature to efficiently restore/apply/commit a snapshot (that is only dump the cow data onto the original volume without writing the whole volume) or does that feature exist already and I missed it? Thanks, Stephane _______________________________________________ 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/
