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On Mon, 2012-07-16 at 15:20 +0400, Boris Filippov wrote:
> Current snapshot implementation for libvirt driver doesn't support
> snapshotting for everything except qcow2 (as i remember, because
> virDomainManagedSave
> will fail on everything except qcow2).

Sheepdog also supports the save_vmstate/load_vmstate methods.

But qemu can also write the vm state outside of the backend image, which
should be usable with all image backends.