On 11/09/2011 11:02 AM, Avi Kivity wrote:
On 11/09/2011 06:39 PM, Anthony Liguori wrote:
Migration with qcow2 is not a supported feature for 1.0. Migration is
only supported with raw images using coherent shared storage[1].
[1] NFS is only coherent with close-to-open which right now is not
good enough for migration.
Say what?
Due to block format probing, we read at least the first sector of the disk
during start up.
Strictly going by what NFS guarantees, since we don't open on the destination
*after* as close on the source, we aren't guaranteed to see what's written by
the source.
In practice, because of block format probing, unless we're using cache=none, the
first sector can be out of sync with the source on the destination. If you use
cache=none on a Linux client with at least a Linux NFS server, you should be
relatively safe.
Regards,
Anthony Liguori
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