RHEL High Availability cluster nodes on IBM z Systems experience STONITH-device timeouts around midnight on a nightly basis

Solution Verified - Updated -


  • My z guest cluster-nodes report STONITH-device monitor timeouts around midnight
  • IBM z Systems guests are failing to fence - showing timeouts from the fence-device
  • z/VM guest fencing through SMAPI is slow or failing around midnight on a nightly basis


  • Red Hat Enterprise Linux (RHEL) 7, 8 with the High Availability Add-On
  • Cluster members are z/VM guests using fence_zvmpi SMAPI fencing

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