Both nodes in a two-node cluster race to fence each other even though they are using a quorum device without a heuristic which should enable master_wins in RHEL 6

Solution Unverified - Updated -

Issue

  • In a 2 node cluster both nodes fenced each other causing a reboot, even though we have a qdisk with master_wins enabled.
  • I have a quorum device without any heuristics in a two node cluster, and so I expect master_wins to be automatically enabled, however both nodes are showing that they have a quorum device vote in cman_tool status output:
[root@node1 ~]# cman_tool status
[...]
Expected votes: 3
Quorum device votes: 1
Total votes: 3
Node votes: 1
[...]

[root@node2 ~]# cman_tool status
[...]
Expected votes: 3
Quorum device votes: 1
Total votes: 3
Node votes: 1
[...]
  • Both nodes in the cluster raced to fence each other even though I'm using a master_wins configuration

Environment

  • Red Hat Enterprise Linux (RHEL) 6 with the High Availability Add On
  • A cluster consisting of exactly two nodes
  • Cluster utilizing a quorum device (<quorumd> in /etc/cluster/cluster.conf)
    • The intended configuration is for master_wins to be enabled
    • There are no <heuristics> specified in /etc/cluster/cluster.conf
    • The <quorumd> tag does not specify master_wins="1", but rather is left blank with the expectation that it will be auto-enabled
    • The <quorumd> tag specifies a votes="<count>" attribute

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