On Thu 21 Jan 2016 05:58:42 PM CET, Eric Blake <ebl...@redhat.com> wrote: >>>> In general, what do you do to make sure that the data in a new Quorum >>>> child is consistent with that of the rest of the array? >>> >>> Quorum can have more than one child when it starts. But we don't do >>> the similar check. So I don't think we should do such check here. >> >> Yes, but when you start a VM you can verify in advance that all >> members of the Quorum have the same data. If you do that on a running >> VM how can you know if the new disk is consistent with the others? > > User error if it is not. Just the same as it is user error if you > request a shallow drive-mirror but the destination is not the same > contents as the backing file. I don't think qemu has to protect us > from user error in this case.
But the backing file is read-only so the user can guarantee that the destination has the same data before the shallow mirror. How do you do that in this case? Berto
