Hi Nir,

Just to report.
As suggested, I created a Posix compliant storage domain with CephFS
and copied my templates to CephFS.
Now I created VMs from CephFS templates and the storage error happens again.
As I understand, the storage growth issue is only on iSCSI.

Am I doing something wrong?

Kind regards,
Shantur

On Wed, Aug 11, 2021 at 2:42 PM Nir Soffer <nsof...@redhat.com> wrote:
>
> On Wed, Aug 11, 2021 at 4:24 PM Arik Hadas <aha...@redhat.com> wrote:
> >
> >
> >
> > On Wed, Aug 11, 2021 at 2:56 PM Benny Zlotnik <bzlot...@redhat.com> wrote:
> >>
> >> > If your vm is temporary and you like to drop the data written while
> >> > the vm is running, you
> >> > could use a temporary disk based on the template. This is called a
> >> > "transient disk" in vdsm.
> >> >
> >> > Arik, maybe you remember how transient disks are used in engine?
> >> > Do we have an API to run a VM once, dropping the changes to the disk
> >> > done while the VM was running?
> >>
> >> I think that's how stateless VMs work
> >
> >
> > +1
> > It doesn't work exactly like Nir wrote above - stateless VMs that are 
> > thin-provisioned would have a qcow volume on top of each template's volume 
> > and when they starts, their active volume would be a qcow volume on top of 
> > the aforementioned qcow volume and that active volume will be removed when 
> > the VM goes down
> > But yeah, stateless VMs are intended for such use case
>
> I was referring to transient disks - created in vdsm:
> https://github.com/oVirt/vdsm/blob/45903d01e142047093bf844628b5d90df12b6ffb/lib/vdsm/virt/vm.py#L3789
>
> This creates a *local* temporary file using qcow2 format, using the
> disk on shared
> storage as a backing file.
>
> Maybe this is not used by engine?
>
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