Description of problem: after removing a node from a 3 node cluster, fencing either of the remaining nodes causes loss of quorum Version-Release number of selected component (if applicable): RHEL4 Update3 How reproducible: always Steps to Reproduce: 1. start with 3 node cluster, remove 1 node completely 2. instigate a fence operation on either of the remaining nodes 3. fencing causes loss of quorum Actual results: loss of quorum Expected results: since it is now a 2 node cluster, quorum should not be lost Additional info: graceful shutdown of one of the remaining nodes by stopping cman does not cause loss of quorum
If you remove a node from a 3-node cluster you don't get a two-node cluster unfortunately. What you actually have is a 3-node cluster with one node removed and quorum artificially lowered. The two_node cluster (as in the cluster.conf key) is a special case in cman and requires a full cluster reboot to enable/disable the features that mean it can continue with only a single node active. If you need a 3 node cluster to keep running with only one active node you will need to configure a quorum device using qdiskd.