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

On 1/8/15 2:48 PM, Eric Blake wrote: >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). > I've responded to Kashyap about this with the solution to my problem. It was a usage error.