[Pacemaker] preventing cluster doing any action when load reaches some threshold

[Dejan Muhamedagic]

Hi,

On Sun, Jun 19, 2011 at 04:34:24PM +0200, Nikola Ciprich wrote:
> Hello Andrew et al,
> 
> few times, it happened to me, that cluster node got loaded too much
> (especially I/O load), so cluster actions (monitor) started to timeout.
> So cluster manager decided to restart services etc, thus causing even
> higher load (especially when cluster has tens of services). Is there 
> any way, to tell that when loadavg reaches some threshold (ie 10), 
> manager should postpone all actions?

No.

> Or is there some more elegant way to deal with this kind of situation?

What do your monitor timeouts look like? You should probably
adjust them. Take a look here for some notes about the problem:

http://www.linux-ha.org/wiki/File:Linuxtag-09-ha-paper.pdf
http://www.advogato.org/person/lmb/diary.html

Thanks,

Dejan

> Thanks a lot in advance!
> nik
> 
> 
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