Re: [Qemu-discuss] Disk Corruption

[Jacob Godin]

We've never had this issue before, and do run a lot of VMs that get shutdown fairly regularly. I think the issue may be related somehow to the snapshot and/or disk size vs virtual size, but I'm not 100% sure.

On Thu, Jun 2, 2016 at 3:30 AM, Dominique Ramaekers <address@hidden> wrote:

> -----Oorspronkelijk bericht-----
> Van: Qemu-discuss [mailto:qemu-discuss-
> bounces+dominique.ramaekers=address@hidden] Namens Jakob Bohm
> Verzonden: woensdag 1 juni 2016 20:30
> Aan: Jacob Godin
> CC: address@hidden
> Onderwerp: Re: [Qemu-discuss] Disk Corruption
....

> >
> >
> >     How did you "power off" the VM?
> >
> >
> > Using virsh shutdown
> >
> >
> >     Did you use some qemu management tool (which one and which version)?
> >
> >
> > libvirt version 1.2.2 (1.2.2-0ubuntu13.1.17)
> >
> >
> >     Did you kill the qemu process?
> >
> >
> > We made sure it was dead before taking the snap.
>
> Not clear: Did you *kill* the qemu process or did it exit all by itself when you
> shut down the guest?
>
> And the same question back when you made the snapshot.
>
> >
> >
> >     Did you do a "clean" shutdown of the Guest OS and wait for the Guest
> >     OS to tell the qemu process to exit on its own?
> >
> >
> > Yes, virsh shutdown issues a safe shutdown via ACPI
>
> Other people on this list may know more about what that libvirt version does in
> this situation (beside the initial "polite" request via a qemu command to
> generate the ACPI event).
>
...

I want to note:
Two times I also had a corrupted disk after a shutdown with virsh shutdown. I had the feeling virsh destroyed the domain when the shutdown took to long. I know this shouldn't be the behavior of virsh shutdown, but still... Now I use commands like this to be sure virsh only uses safe shutdown methods:
$ virsh shutdown $VM --mode=agent || virsh shutdown $VM --mode=acpi
# if the shutdown trough the agent doesn't work, do a acpi shutdown...