[libvirt-users] Migrate VM's to different storage pool?

[Jamie Fargen]

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 at 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
>
>
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