[Pacemaker] resource monitor priority - timeout on high load

[Radoslaw Garbacz]

Indeed, I do not see actual failures due to a timeout.

Thanks Dejan,

On Tue, Oct 6, 2015 at 3:37 AM, Dejan Muhamedagic <dejanmm at fastmail.fm>
wrote:

> Hi,
>
> On Mon, Oct 05, 2015 at 12:53:25PM -0500, Radoslaw Garbacz wrote:
> > Hi,
> >
> > I have a situation, when resource monitor operations timeout on system
> high
> > load.
> >
> > One thing to do is to increase timeouts, but there can always be load, at
> > which the timeout event would happen, and on the other hand too long
> > timeouts would not be very useful,
>
> Why do you think so? Did you see actual failures due to a
> timeout, i.e. a process just hanging in limbo?
>
> > so I would like to increase the priority
> > of monitoring processes (GNU Linux), but I do not want to be too broad.
>
> If that could make the server a bit bigger too ;-)
>
> Seriously, IMO you have two options: either add more resources
> (as in hardware) or increase the monitor timeouts.
>
> Thanks,
>
> Dejan
>
> > So my question is, which pacemaker process should I target to ensure
> timely
> > monitoring operations, or maybe even there is a pacemaker configuration
> > parameter, which would help in such a case.
> >
> > I know for sure, that agents finish they monitoring requests on time, and
> > the timeout is due to high load. I have several agents, so I will provide
> > just some details to illustrate the case:
> > - timeout: ~60s
> > - interval: ~60s
> > - normal (low load) monitor request time: 0.2s
> > - high load monitor request time: 8s - when pacemaker reports resource
> > operation timeout
> >
> >
> > Thanks,
> >
> > --
> > Best Regards,
> >
> > Radoslaw Garbacz
> > XtremeData Incorporation
>
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-- 
Best Regards,

Radoslaw Garbacz
XtremeData Incorporation
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