[Users] oVirt support for backup/restore

[Karli Sjöberg]

sön 2013-04-21 klockan 08:42 -0400 skrev Ayal Baron:



----- Original Message -----
> On 04/19/2013 11:46 AM, Gianluca Cecchi wrote:
> > On Fri, Apr 19, 2013 at 9:58 AM, Itamar Heim wrote:
> >
> >>
> >> qemu-guest-agent isn't ovirt/rhev-guest-agent.
> >> now that qemu started their own guest agent, ovirt/rhev-guest-agent isn't
> >> used for things covered by the qemu-guest-agent.
> >
> > Ah, ok.
> > SO after reading
> > http://wiki.libvirt.org/page/Qemu_guest_agent
> > some questions
> >
> > can we use ootb qemu-guest-agent with ovirt 3.2.1 if we have for
> > example a CentOS 6 guest (with qemu-guest-agent-0.12.1.2-2.355)?
> > Does oVirt create a virtio-serial port to communicate with libvit and
> > does it use libvirt with any options to quiesce  fs on guest?
>
> iirc, it should work - testing/feedback would be welcome.

I believe vdsm does not create the virtio-serial port when starting the VM, so you'd have to modify this behaviour with hooks [1].
Once you do that, whenever you create a live snapshot vdsm will notify libvirt to quiesce first.
Note that afaik, quiesce in qemu-ga is only supported for Linux guests.


Really cool to hear how things are progressing! The qemu-ga quiesces what exactly? The guest filesystem? What about potential applications that might be running inside the guest? Can you call live snapshots of a linux guest "Application Consistent"?

The good thing about Microsoft VSS is that MS applications are registered to VSS so that when you trigger VSS to quiece, all of the other applications are told to pause as well.

/Karli



VSS quiesce support patches have been submitted, but I'm not sure what the status is there yet.

[1] Hooks preso: http://www.ovirt.org/File:OVirt-hooks-netapp-jan2013.odp

>
> >
> > Can one use as an alternative the command fsfreeze in CentOS 6.4 guest
> > (even if in tech preview) as in :
> > https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Technical_Notes/storage.html
> >
>
> what i remember is that it supposed to be pluggable/configurable for you
> to run the relevant commands you want.
> ayal may remember better
>
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Med Vänliga Hälsningar
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Karli Sjöberg
Swedish University of Agricultural Sciences
Box 7079 (Visiting Address Kronåsvägen 8)
S-750 07 Uppsala, Sweden
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karli.sjoberg at slu.se<mailto:karli.sjoberg at adm.slu.se>
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