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

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(a)roma1.infn.it&gt; 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.