[ovirt-users] Exporting VMs using cinder disks and importing ceph disks from cinder

[Alessandro De Salvo]

Hi Nir,

On Thu, 2016-07-21 at 17:25 +0300, Nir Soffer wrote:
> On Thu, Jul 21, 2016 at 4:58 PM, Alessandro De Salvo
> <Alessandro.DeSalvo at roma1.infn.it> wrote:
> > Hi,
> > I'm trying to export VMs using ceph disks on ovirt 4. The export itself
> > works, but the disks are not saved in the export domains, only the VM
> > definition is stored. Also, I cannot easily re-import them, unless I
> > clone the VM instead of importing it, it just fails.
> > Cinder itself can backup volumes, if instructed to do so.
> > However, let's say I would like to export the machine from an ovirt
> > infrastructure and load it into another one passing by the export domain
> > and sharing the same underlying ceph cluster. I could easily load the VM
> > from the export domain into the second ovirt infrastructure, but how can
> > I define the disk, whose volume exists in the cinder instance, in the
> > second ovirt? I do not see any obvious way to map an existing cinder
> > volume into ovirt, without creating a new disk, which would not be
> > helpful.
> > As a consequence of all this, in case of problems with the disks, there
> > is no way to recover them.
> > Any help?
> 
> We do not support copying, moving, or exporting disks to/from ceph yet.
> 
> You can copy the disks manually from ceph using ceph command line
> tools, and qemu-img should also handle them.

Yes, I just found a trick to re-import the disk, using qemu-img to dump
the image on a file from rbd:<pool>/<file>, create a new disk in ovirt
and use qemu-img to copy it back on the new image. Technically it is
working, but it's a bit convoluted. Any plans to add the relevant
support in ovirt?

> 
> After you copy an image, you will a have a raw image that can be
> uploaded to new ovirt disk from engine ui (new image upload feature).

Are you talking to the upload button in the Disks tab? I do not see how
I can upload to cinder/ceph from there. The only way I found was the
trick described above.
Thanks,

	Alessandro

> 
> Nir