3:30 p.m.
Hi Martin,
Thanks for clarifying that.
Best Regards,
Strahil NikolovOn Jun 14, 2019 13:02, Martin Sivak <msivak(a)redhat.com> wrote:
>
> Hi,
>
> > 2019-06-13 07:11:40,973 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 695648 to 660865
> > 2019-06-13 07:12:51,437 - mom.GuestMonitor.Thread - INFO - GuestMonitor-node1
ending
> >
> > Can someone clarify what exactly does this (from xxxx to yyyy) mean ?
>
> It is the ballooning operation log:
>
> - From - how much memory was left in the VM before the action
> - To - how much after (could be both lower and higher)
>
> I do not remember the units, but I think it was in KiB.
>
> Martin
>
>
> On Thu, Jun 13, 2019 at 9:26 PM Strahil Nikolov <hunter86_bg(a)yahoo.com> wrote:
> >
> > Hi Martin,Darrell,
> >
> > thanks for your feedback.
> >
> > I have checked the /var/log/vdsm/mom.log and it seems that MOM was actually
working:
> >
> > 2019-06-13 07:08:47,690 - mom.GuestMonitor.Thread - INFO - GuestMonitor-node1
starting
> > 2019-06-13 07:09:39,490 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 1048576 to 996147
> > 2019-06-13 07:09:54,658 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 996148 to 946340
> > 2019-06-13 07:10:09,853 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 946340 to 899023
> > 2019-06-13 07:10:25,053 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 899024 to 854072
> > 2019-06-13 07:10:40,233 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 854072 to 811368
> > 2019-06-13 07:10:55,428 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 811368 to 770799
> > 2019-06-13 07:11:10,621 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 770800 to 732260
> > 2019-06-13 07:11:25,827 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 732260 to 695647
> > 2019-06-13 07:11:40,973 - mom.Controllers.Balloon - INFO - Ballooning
guest:node1 from 695648 to 660865
> > 2019-06-13 07:12:51,437 - mom.GuestMonitor.Thread - INFO - GuestMonitor-node1
ending
> >
> > Can someone clarify what exactly does this (from xxxx to yyyy) mean ?
> >
> > Best Regards,
> > Strahil Nikolov
> >
> > В четвъртък, 13 юни 2019 г., 17:27:01 ч. Гринуич+3, Martin Sivak
<msivak(a)redhat.com> написа:
> >
> >
> > Hi,
> >
> > iirc the guest agent is not needed anymore as we get almost the same
> > stats from the balloon driver directly.
> >
> > Ballooning has to be enabled on cluster level though. So that is one
> > thing to check. If that is fine then I guess a more detailed
> > description is needed.
> >
> > oVirt generally starts ballooning when the memory load gets over 80%
> > of available memory.
> >
> > The host agent that handles ballooning is called mom and the logs are
> > located in /var/log/vdsm/mom* iirc. It might be a good idea to check
> > whether the virtual machines were declared ready (meaning all data
> > sources we collect provided data).
> >
> > --
> > Martin Sivak
> > used to be maintainer of mom
> >
> > On Thu, Jun 13, 2019 at 12:26 AM Darrell Budic <budic(a)onholyground.com>
wrote:
> > >
> > > Do you have the overt-guest-agent running on your VMs? It’s required for
ballooning to control allocations on the guest side.
> > >
> > > On Jun 12, 2019, at 11:32 AM, Strahil <hunter86_bg(a)yahoo.com> wrote:
> > >
> > > Hello All,
> > >
> > > as a KVM user I know how usefull is the memory balloon and how you can both
increase - and also decrease memory live (both Linux & Windows).
> > > I have noticed that I cannot decrease the memory in oVirt.
> > >
> > > Does anyone got a clue why the situation is like that ?
> > >
> > > I was expecting that the guaranteed memory is the minimum to which the
balloon driver will not go bellow, but when I put my host under pressure - the host just
started to swap instead of reducing some of the VM memory (and my VMs had plenty of free
space).
> > >
> > > It will be great if oVirt can decrease the memory (if the VM has
unallocated memory) when the host is under pressure and the VM cannot be relocated.
> > >
> > > Best Regards,
> > > Strahil Nikolov
> > >
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