On 11/10/2011 02:55 AM, Avi Kivity wrote:
On 11/09/2011 07:35 PM, Anthony Liguori wrote:
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.
IMO, this should be a release blocker. qemu 1.0 only supporting
migration on enterprise storage?
No, this is not going to block the release.
You can't dump patches on the ML during -rc for an issue that has been
understood for well over a year simply because it's release time.
If this was so important, it should have been fixed a year ago in the proper way.
Regards,
Anthony Liguori
If we have to delay the release for a month to get it right, we should.
Not that I think we have to.
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