Eric, Following along with your direction I get stuck at virsh blockcopy. I receive an error "unsupported configuration: block copy is not supported with this QEMU binary." As I originally explained this host is running Red Hat EL6.3. Is live blockcopy supported in EL6.3? Packages: qemu-kvm-0.12.1.2-2.295.el6_3.2.x86_64 libvirt-client-0.9.10-21.el6_3.4.x86_64 Regards, Jamie Ian Fargen On Tue, Feb 12, 2013 at 10:12 AM, Eric Blake <eblake@redhat.com> wrote:
On 02/12/2013 06:22 AM, Jamie Fargen wrote:
Eric-
[Please don't top-post on technical lists]
Why wouldn't a 'virsh blockcopy --pivot domain src dest' be sufficient to migrate the volumes to a new storage pool?
It IS sufficient, as part of the sequence I documented here:
# save off the persistent definition for later virsh dumpxml --inactive $dom > $dom.xml # make the guest transient virsh undefine $dom # remind myself which disks need migration virsh domblklist $dom # for each disk (such as "vda"), do a migration virsh blockcopy $dom $disk /path/to/new --wait --verbose --pivot # make the guest persistent again virsh define $dom.xml
Or maybe I'm misunderstanding your question. Are you asking why blockcopy doesn't work with a persistent domain? And the answer to that is because as of at least qemu 1.4, there is no support for remembering the progress of a block copy across a domain restart; there have been patches proposed for qemu 1.5 that add a persistent bitmap, and there are plans to teach libvirt to use this new feature to allow 'virsh blockcopy' even for a persistent domain, so that you don't have to juggle through the steps of going to a transient domain just to do the blockcopy.
-- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org