[ovirt-users] oVirt VM backup and restore

[Yaniv Kaul]

On Thu, Mar 9, 2017 at 12:40 PM Nathanaël Blanchet <blanchet at abes.fr> wrote:

>
>
> Le 09/03/2017 à 10:25, Gianluca Cecchi a écrit :
>
> On Wed, Mar 8, 2017 at 6:05 PM, Gianluca Cecchi <gianluca.cecchi at gmail.com
> > wrote:
>
>
>
> NOTE: during the snapshot creation I see in web admin console the VM in
> paused state and also not responsive in both console and ssh session.
> After a couple of seconds it comes back and as a confirmation I see this
> in its messages:
>
> Mar  8 17:38:57 T-ORACLE73 chronyd[616]: System clock wrong by 19.077230
> seconds, adjustment started
>
> Is this expected?
>
>
>
>
> Possibly the default changed at some point in time, so that now it saves
> memory and so this implies pause of VM
>
> Saving memory is essential in some apàplications like DB, so you won't
> bypass vm pauses for such a stuff
>

In a database, you actually want to ensure all transactions are complete
for an application-complete snapshot. I don't think memory is needed.
Y.


>
> In the mean time I verified changing backup.py this way solves the problem
> (the 3.6 api deprecation still in place... ;-):
>
> $ diff backup.py backup.py.orig
> 123c123
> <
> vm.snapshots.add(params.Snapshot(description=config.get_snapshot_description(),
> vm=vm,persist_memorystate=False))
> ---
> >
> vm.snapshots.add(params.Snapshot(description=config.get_snapshot_description(),
> vm=vm))
>
> The snapshot doesn't include memory and no problem at VM OS side now
>
> Tested also getting the parameter from config file
>
> Modifications needed in this case:
>
> 1)
> $ diff backup.py backup.py.orig
> 123c123
> <
> vm.snapshots.add(params.Snapshot(description=config.get_snapshot_description(),
> vm=vm,persist_memorystate=config.get_persist_memorystate()))
> ---
> >
> vm.snapshots.add(params.Snapshot(description=config.get_snapshot_description(),
> vm=vm))
>
>
> 2)
> $ diff config.py config.py.orig
> 34d33
> <             self.__persist_memorystate =
> config_parser.getboolean(section, "persist_memorystate")
> 113,116d111
> <
> <
> <     def get_persist_memorystate(self):
> <         return self.__persist_memorystate
>
>
> And in config file called add:
>
> # Save Memory in snapshot
> persist_memorystate=False
>
> It could be further improved if one wants to differentiate save memory for
> some VMs and not for other ones....
>
> HIH other ones,
> Gianluca
>
>
> --
> Nathanaël Blanchet
>
> Supervision réseau
> Pôle Infrastrutures Informatiques
> 227 avenue Professeur-Jean-Louis-Viala
> 34193 MONTPELLIER CEDEX 5 	
> Tél. 33 (0)4 67 54 84 55
> Fax  33 (0)4 67 54 84 14blanchet at abes.fr
>
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