On 04/26/2016 07:54 AM, Dmitry Mishin wrote:
> Hmm. Interesting. But what I'm talking about doesn't
involve qemu much.
> We create
> an external temporarily delta for images with internal snapshots on
> libvirt side,
> then merge it on libvirt side thus, qemu shouldn't be affected at all as
> far as I
> understand.
Right now, we are trying the following workaround of this issue:
1) create external snapshot (without metadata)
2) undefine internal snapshots' metadata (because libvirt prohibits
migration if detects snapshots)
3) copy metadata & backing file (primary data qcow2 file with internal
snapshots) to the destination
4) migrate VM using libvirt
5) define metadata back
6) block-commit - to merge delta to original qcow2 image.
Yes, that looks like a reasonable workaround.
Things would be much simpler, if they were in libvirt rather than in
management app on top of it.
It would indeed be easier - but someone has to contribute the patches
for it.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library
http://libvirt.org