On 6 October 2016 at 12:59, Eric Blake <ebl...@redhat.com> wrote: > Libvirt also learned that the qemu 'migrate-to-disk' format (used by > 'savevm' or 'migrate') is NOT self-descriptive - in order to fully and > safely revert to an earlier state, you HAVE to store the command line > (or a way to regenerate the command line) that was associated with the > qemu whose state you saved, along with tracking all hotplugs. Since a > mere 'savevm' REQUIRES external information to safely be restored, you > would have to figure out a way to store this additional information > alongside whatever save files you plan on creating (and please don't > change the qcow2 file format to become a dumping grounds for this > additional information).
Good point. I think this is a fairly strong argument for keeping the "user friendly" interface to snapshots in the VM management layer, not QEMU itself. thanks -- PMM
