On 02/13/2013 12:31 AM, Jamie Fargen wrote:
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?
This after discussion from Eric. A small example. Note this was on latest Fedora, though: http://kashyapc.fedorapeople.org/virt/lc-2012/live-backup-with-blockcopy.txt
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 <mailto: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 <tel:%2B1-919-301-3266> Libvirt virtualization library http://libvirt.org
_______________________________________________ libvirt-users mailing list libvirt-users@redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users
-- /kashyap