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