How can I avoid a loss of quorum on remaining nodes in my cluster when I stop cman on one or more nodes in RHEL 6?

Solution Unverified - Updated -

Issue

  • If I stop cluster services on several nodes in the cluster, the remaining nodes lose quorum because they don't have enough votes left. How can I stop those nodes but allow the remaining nodes to continue operating?
  • Is there a way to tell cman to decrease quorum for the remaining nodes when one node leaves "gracefully"?
  • How can I stop a node to perform maintenance on it or reboot without causing a loss of quorum on other nodes?

Environment

  • Red Hat Enterprise Linux (RHEL) 6 with the High Availability Add On
    • NOTE: The desired behavior described in this solution is achieved automatically in RHEL 5 when issuing service cman stop, so nothing more is required.
  • A cluster containing more than two nodes

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