Re: [libvirt] snapshots and LVM
Le mardi 11 mai 2010 à 19:06 -0400, edison a écrit :
--
Daniel Berteaud
FIREWALL-SERVICES SARL.
Société de Services en Logiciels Libres
Technopôle Montesquieu
33650 MARTILLAC
Tel : 05 56 64 15 32
Fax : 05 56 64 15 32
Mail: daniel(a)firewall-services.com
Web : http://www.firewall-services.com
This new feature sounds cool. I just had a try, found a problem,
when
merging a LVM snapshot:
lvconvert says:
Can't merge over open origin volume
Merging of snapshot snap0 will start next activation.
The origin volume is open by QEMU, although the VM is already
stoped(by Issuing 'stop' command in QEMU monitor)
Of course, you cannot do this while a VM is running (even stopped). To
revert to a snapshot, you need to destroy the domain, start the snapshot
merge with lvconvert (there's also the possibility to tag several
snapshot, and to revert all of them with a simple lvconvert --merge
@tag). Now, you need to de-activate/re-activate the LV, so the merge can
start (with lvchange -an vg/lv, lvchange -ay vg/lv). Then, libvirt could
restore the state of the domain, associated with the snapshot if the
domain was active at the time it was taken.
Regards
LVM merging feature doesn't support merge when the origin volume
is
opened?
What's the mean of next activation? From the patch
(http://people.redhat.com/msnitzer/patches/snapshot-merge/lvm2/LVM2-2.02.5...),
looks like "lvchange --refresh orig_lvm" will active it? I did it, but no
way...