[ClusterLabs] Resource placement strategy and utilization AND resource location preference
Vallevand, Mark K
Mark.Vallevand at UNISYS.com
Tue Oct 27 17:24:19 EDT 2015
How do the resource placement strategy and utilization AND resource location preference relate?
I mean, is it one or the other? Or both somehow?
If I set a resource location preference, how will that affect placement strategy like balanced? Vice versa.
Here's the problem I'm looking at.
I have a large number of resources that have very different utilization values. Say 1-10. All my nodes have the same utilization values. I want the placement to be balanced. That works nicely. Consider what happens when a node fails and then rejoins the cluster. The balanced placement moves the resources when the node fails and again when it rejoins. It's not good to have resources move. Setting a resource-stickiness helps when the node fails. Rebalancing seems to be sane. But, when the node rejoins, the resources stick where they are and the rejoining node carries no load. If I don't do any resource placement strategy at all and consider each resource to be equal, I can set resource location preferences so that resources move when the node fails and return to it when it rejoins.
I want it all. :-)
I want the resources to be placed with balanced regard to utilization.
I want only the resources on a failed node to be reallocated to remaining nodes (with balanced utilization as much as possible).
I want those resources to return to the node when it rejoins. (Or a subset of them if that balances better.)
I could ignore placement strategy and script up resource location preferences that mimic a balanced load. But, I'd rather let clustering do it.
Any ideas would be very welcome.
Mark K Vallevand Mark.Vallevand at Unisys.com<mailto:Mark.Vallevand at Unisys.com>
Never try and teach a pig to sing: it's a waste of time, and it annoys the pig.
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