corosync does not run with a realtime scheduling priority in a RHEL 7 High Availability cluster

Solution Unverified - Updated -

Issue

  • corosync ran with the SCHED_RR realtime scheduling policy in RHEL 6, but now runs with the SCHED_OTHER policy using a nice value of 20.
  • My cluster nodes are experiencing frequent fencing or "processor failures" in the cluster whenever there is a minor amount of load placed on the nodes
  • Cluster nodes are being fenced frequently

Environment

  • Red Hat Enterprise Linux (RHEL) 7 with the High Availability Add On
  • corosync releases prior to 2.3.4-4.el7_1.3
    • On those releases, COROSYNC_OPTIONS in /etc/sysconfig/corosync does not include -r

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