[ClusterLabs] When does Pacemaker shoot other nodes in the head

[Auer, Jens]

Hi,

a client asked me to describe the conditions when Pacemaker uses STONITH to bring the cluster into a known state. The documentation says that this happens when "we cannot establish with certainty a state of some node or resource", but I need some more concrete explanations. Specifically, he is wondering what happens when
1. a resource, e.g. a virtual ip, fails to often
2. the heartbeats of one of the cluster nodes are not received anymore
3. combinations of these two

Is there some better definition of the conditions which trigger STONITH?

Best wishes,
  jens

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