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
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