Re: [libvirt-users] Using virsh blockcopy -- what's it supposed to accomplish?

On 12/23/2014 05:24 PM, Gary R Hook wrote: > I read that article. > > Now shut down the domain (post-pivot) which is using the new disk file, > and start it up, without using a block device. This is the part that no > one seems to write about, nor do I see that in your example. But thank > you very much for your help and your articles; very much appreciated. What do you mean by "without using a block device"? Are you trying to revert back to the pre-copy file? Libvirt is supposed to rewrite the domain XML to reflect the end result of breaking the mirroring (whether you pivot or abort back to the original), and further starts of the domain should use the correct current file (which might not be the file that the earlier domain start used). If you abort a blockcopy before it is complete, the destination is useless (incomplete). If you end a blockcopy after it reached mirroring phase, the the file that you abandon (whether the original if you pivoted, or the destination if you aborted) is a point-in-time snapshot of the disk at the point you quit the mirroring; this disk snapshot is liable to need fsck and otherwise have inconsistencies unless you also ensured that guest I/O was stable before the point of breaking the mirroring (basically, using guest-agent freezing and thawing around the operation).