A node was fenced after "A processor failed, forming new configuration" in a High Availability cluster with Pacemaker

Solution Verified - Updated -


  • What does the message "A processor failed, forming new configuration." from corosync mean on a RHEL 6/7/8/9 cluster node?
May  7 18:37:11 node2 corosync[12718]:   [TOTEM ] A processor failed, forming new configuration.
May  7 18:37:23 node2 corosync[12718]:   [QUORUM] Members[2]: 2 3
May  7 18:37:23 node2 corosync[12718]:   [TOTEM ] A processor joined or left the membership and a new membership was formed.
  • Why was a cluster node fenced after "a processor failed" was reported by other nodes?
  • How can I troubleshoot what caused a node to fail in my cluster?
  • Why was my cluster node fenced?
  • Cluster node communication problem.
  • Root Cause of cluster communication issue.
  • Cluster node fenced need RCA.
  • My cluster experienced a token loss and fencing


  • Red Hat Enterprise Linux (RHEL) 6, 7, 8 or 9 with the High Availability Add On
  • Pacemaker

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