16.03.2011 10:29, Andrew Beekhof:
I still don't understand why it monitors services by default on all nodes
when the cluster is assymetrical
Because we don't just make assumptions about what the state of the
cluster is - we verify them.
Actually, you verify what misconfigured or fake resource agents are
saying. Very sane check, indeed.
Take DRBD for example. Any resource may be configured on no more than
two nodes. If there are more nodes in the cluster, N-2 of them will
check for nothing, fail to check from time to time and cause service
instability. Imagine a highly overloaded or broken node where all,
including fake, resource agents are failing to respond in timely manner.
Every service in such a cluster may suffer from this problem.
Well, your approach to monitoring is reasonable for symmetrical cluster.
I beg your pardon if my objections are inappropriate.
--
Pavel Levshin
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