Fabio,
Did you tried to create a VM based on a template with thin-provisioning
mode?
This looks like this is what you want to to achieve. The VM will have a
QCOW disk based on the template disk that will stay Read-Only.
Regards,
Freddy
On Thu, Sep 19, 2019 at 10:50 AM Simone Tiraboschi <stirabos(a)redhat.com>
wrote:
On Thu, Sep 19, 2019 at 9:24 AM <marzoccafabio(a)gmail.com> wrote:
> Hi,
>
> I am approaching and studying oVirt in order to propose the solution to a
> customer as a replacement for a commercial solution they have now.
> They only need Desktop virtualization.
> Sorry for the silly question, but I can't find a way to deploy a VM
> (template) to users as a "linked-clone", meaning that the users' image
> still refers to the original image but modification are written (and
> afterwards read) from a new location. This technique is called
> Copy-on-write.
> Can this be achieved with oVirt?
>
Hi,
oVirt provides VM Pools:
https://www.ovirt.org/documentation/admin-guide/chap-Pools.html
but the VMs in pool are designed to be stateless and so, on that user
case, the user specific data should stored on an external (not on the VM
disk) storage area like an NFS or SMB/CIFS share mounted inside the VM at
user login time.
Probably you can achieve something closer to your initial idea relying on
oVirt-CinderLib integration over a capable SAN or a Ceph storage.
https://ovirt.org/develop/release-management/features/storage/cinderlib-i...
Please be aware that in 4.3 cinder-lib integration is still a
"tech-preview" grade feature and the design of the whole solution will
probably require a relevant integration/configuration effort on your side
to correctly achieve copy-on-write behaviour on storage side.
>
> Fabio
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