[ovirt-users] storage offload capability

[Itamar Heim]

On 11/13/2014 06:09 AM, Paul Jansen wrote:
> I have an ovirt 3.5 cluster set up with three el7 hosts.  Storage is
> provided by two Fedora 20 machines and the connection is via multipath
> iscsi.
> The performance is quite good.  The Fedora 20 iscsi targets are using
> the 'target' (ie: lio) framework, which support the various t.10 scsi
> offloads.  Vmware supports a subset of these called VAAI and Microsoft
> has a subset called ODX.
> Cloning is one if the t.10 extensions that the lio target framework
> supports.
> I just tried cloning a vm and noticed that during the process there is a
> lof of traffic over the iscsi interfaces on the Storage Pool Manager
> host and the iscsi target machine.
> With proper support for t.10 cloning I shoudn't see any traffic on the
> isci links (or very minimal traffic)
> Is there some way to enable the storage offload functionality in Ovirt?
> If not, is this on the VDSM roadmap?  If support were worked in this
> should be able to be applied to FCP connections as well.  The lio target
> supports these offloads when acting as a Fiber Channel target also.
>
> I've asked this sometime back but there hasn't been much in the way of
> discussion on this users list or the devel list about this feature.
>

yes, on the roadmap, tbd yet on when. netapp did a plugin enabling this 
for their storage array (VSC plugin)
I hope the ceph integration will provide this, though that doesn't solve 
it for other type of storage domains yet.