I don’t normally chime in, but running RHEL on a two node cluster we have found that the only way to ensure fencing works properly is with a 2gb qdisk. The option you were told works correctly less than 50% of the time as both attempt to fence the other. We set up a delay on the passive node so if the active node gets in trouble the qdisk switches to the passive at the end of the delay, and the fencing takes place. The process takes about 5 minutes or so.
A qdisk is just another way to maintain quorum in cluster. there is a special two node cluster mode designed to allow for quorum to be maintained by the surviving node.
<cman two_node="1" expected_votes="1">
But it's not very clear to me what happens with fencing if both nodes get partitioned on the network. Do they both try to fence each other off ?
From: linux-cluster-bounces redhat com [linux-cluster-bounces redhat com] on behalf of emmanuel segura [emi2fast gmail com]
Hello all List