Thanks Josh, that's exactly what I want to know. (BTW: I think that sheepdog block driver also support the save of the vmstate http://lists.wpkg.org/pipermail/sheepdog/2010-April/000368.html ) Regards, Alexandre ----- Mail original ----- De: "Josh Durgin" <josh.durgin@xxxxxxxxxxx> À: "Alexandre DERUMIER" <aderumier@xxxxxxxxx> Cc: ceph-devel@xxxxxxxxxxxxxxx Envoyé: Mercredi 29 Août 2012 18:15:17 Objet: Re: qemu-rbd : savevm monitor command don't save vmstate, is it normal ? On 08/29/2012 06:40 AM, Alexandre DERUMIER wrote: > Hi, > > I'm trying to take a full vm state snapshot with savevm monitor command (qemu 0.12rc1 + rbd 0.48.1) > > it seem that vmstate is not saved in the snapshot. (I also don't notice any vm hang during snapshot) > Snapshot of disk is correctly made. AFAIK the only block backend that supports saving the vmstate is qcow2. For rbd, the savevm/loadvm monitor commands are equivalent to 'rbd snap create' and 'rbd snap rollback'. They just save/rollback the disk. > using loadvm monitor command, rollback correctly to disk snapshot but vm hang. If you don't quiesce i/o i.e. via xfsfreeze (it works on the vfs level now, so it's not xfs-specific anymore) before snapshotting a running vm, the fs might require a fsck to be usable. This is only rolling back the disk, and not the memory state, so doing it while the vm is running is likely to cause problems. > starting qemu with -loadvm snapshotname give > kvm: Error -22 while loading VM state > > > Is it normal ? Not implemented ? bdrv_{save|load}_vmstate are not implemented. > > Regards, > > Alexandre -- -- Alexandre D e rumier Ingénieur Systèmes et Réseaux Fixe : 03 20 68 88 85 Fax : 03 20 68 90 88 45 Bvd du Général Leclerc 59100 Roubaix 12 rue Marivaux 75002 Paris -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
