[libvirt-users] QEMU IMG vs Libvirt block commit

[Erlon Cruz]

On Thu, Jul 28, 2016 at 10:59 AM, Erlon Cruz <sombrafam at gmail.com> wrote:

> Hi folks,
>
> I'm having a issue in the standard NFS driver on OpenStack, that uses
> qemu-img and libvirt to create snapshots of volumes. It uses qemu-img in
> the Controller to manage the snapshots when the volume is not attached
> (offline) or calls the Compute (which calls libvirt) to manage snapshots if
> the volume is attached (online). When I try to create/delete snapshots from
> a snapshot chain. There are 3 situations:
>
> 1 - I create/delete the snapshots in Cinder (it uses qemu-img). It goes
> OK! I can delete and I can create snapshots.
> 2 - I create/delete the snapshots, in online mode (it uses libvirt). It
> goes Ok, as weel.
> 3 - I create the snapshots in Cinder (offline) and delete then in online
> mode (using libvirt), then it fails with this message[1]:
>
> libvirtError: invalid argument: could not find image
> 'volume-13cb83a2-880f-40e8-b60e-7e805eed76f9.d024731c-bdc3-4943-91c0-215a93ee2cf4'
> in chain for
> '/opt/stack/data/nova/mnt/a3b4c6ddd9bf82edd4f726872be58d05/volume-13cb83a2-880f-40e8-b60e-7e805eed76f9'
>
> But, in this folder, there the backing files are there[2] and they are
> chained as think it suppose to be[3].
>
> The version for the 2 hosts in tests are:
> Controller/Cinder node: qemu-img version 2.0.0 && libvirt 1.2.2-0ubuntu13
> Compute node: qemu-img version 2.5.0 && libvirt-1.3.1-1ubuntu10
>
> Is there any compatibility problem between libvirt and qemu-img snapshots?
> Have you guys found any problem like that?
>
> Erlon
> ----------------------------------
>
>
> [1] http://paste.openstack.org/show/543270/
> [2] http://paste.openstack.org/show/543273/
> [3] http://paste.openstack.org/show/543274/
>
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