[ovirt-users] Re: Sparse VMs from Templates - Storage issues
I have actually tried many types of storage now and all have this issue.
I am not of ideas what to do
On Wed, Sep 22, 2021 at 4:39 PM Shantur Rathore
<shantur.rathore(a)gmail.com> wrote:
>
> 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 <nsoffer(a)redhat.com> wrote:
> >
> > On Wed, Aug 11, 2021 at 4:24 PM Arik Hadas <ahadas(a)redhat.com> wrote:
> > >
> > >
> > >
> > > On Wed, Aug 11, 2021 at 2:56 PM Benny Zlotnik <bzlotnik(a)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/45903d01e142047093bf844628b5d90df12b6f...
> >
> > 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?
> >