[ClusterLabs] Antw: question about equal resource distribution
Ulrich.Windl at rz.uni-regensburg.de
Fri Feb 17 02:49:02 EST 2017
>>> Ilia Sokolinski <ilia at clearskydata.com> schrieb am 17.02.2017 um 07:30 in
Nachricht <28DE945E-894F-41B0-B191-53CE90542999 at clearskydata.com>:
> Suppose I have a N node cluster where N > 2 running m*N resources. Resources
> don’t have preferred nodes, but since resources take RAM and CPU it is
> important to distribute them equally among the nodes.
> Will pacemaker do the equal distribution, e.g. m resources per node?
Yes, per primitive, but does not take into account any usage (unless you tell
him to do so).
> If a node fails, will pacemaker redistribute the resources equally too, e.g.
> m * N/(N-1) per node?
If you have a 3-node cluster, and one node fails, the dead resources will be
distributed equally between the remaining nodes (like said above).
> I don’t see any settings controlling this behavior in the documentation,
> perhaps, pacemaker tries to be “fair” by default.
"Utilization" is a good keyword to search. Despite of that there's a German
saying "Probieren geht über studieren", meaning "trying is preferrable over
studying". Sometimes, at least ;-)
> Ilia Sokolinski
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