Just following up this to who, somehow hit this problem in the future...
What happens here is that when libvirt create the snapshots, it held the disk/snapshots information in the domain XML. After I detach the volume, and adding it again, Nova is not adding it the same way it was before detaching, i.e, the backing files are not considered internally in the disk XML representation. So, next step now is to know if its possible/how, to attach a disk with external snapshots to a domain.
On Mon, Aug 1, 2016 at 11:43 AM, Erlon Cruz <sombrafam@xxxxxxxxx> wrote:
On Thu, Jul 28, 2016 at 10:59 AM, Erlon Cruz <sombrafam@xxxxxxxxx> 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/ a3b4c6ddd9bf82edd4f726872be58d 05/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 1.2.2-0ubuntu13Compute node: qemu-img version 2.5.0 && libvirt-1.3.1-1ubuntu10Is there any compatibility problem between libvirt and qemu-img snapshots? Have you guys found any problem like that?Erlon----------------------------------
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