[Linux-cluster] fencing loop in a 2-node partitioned cluster
rajpurush at gmail.com
Tue Feb 24 06:47:31 UTC 2009
I have question regarding a network partition in a 2 node cluster.
Consider a 2-node cluster (node1 and node2) setup with a cross-cable for
heartbeat and setup to use HP iLO as the fencing mechanism. In the event of
network partition (and this case assume that the cross cable was pulled out)
one of the node's succeed in fencing the other. The question is, when the
fenced node on rebooting would it attempt fence the existing node if
it can't communicate with it (since the heartbeat network is still down).
For example consider that in the event of n/w partition, node1 fences node2.
Would node2 on rebooting (can't communicate with node1) would attempt to
fence node1 and form a 1-node cluster.
If yes, can this infinite fencing loop be prevented in 2-node with the use
of a qdisk which denies quorum to node rebooting? Appreciate any suggestions
to prevent this loop.
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