On Thu, May 16, 2013 at 9:44 AM, Richard W.M. Jones <rjo...@redhat.com>wrote:
> Ideally I'd like to issue some QMP commands which would set up the > point-in-time snapshot, and then connect to this snapshot over (eg) > NBD, then when I'm done, send some more QMP commands to tear down the snapshot. > This is actually interesting. Does the QEMU nbd server support multiple readers? Essentially, if you're RWMJ (not me), and you're keeping a full mirror, it's clear that the mirror write stream goes to an nbd server, but is it possible to attach a reader to that same nbd server and read things back (read-only)? I know it's possible to name the volumes you attach to, so I think conceptually with the nbd protocol this should work. I think this document would be better with one or more examples > showing how this would be used. > I think the thread now has me looking at making the mirror command 'active' :-) rather than have a new QMP command. -- Wolf
