Fencing in a Red Hat High Availability Cluster

Solution Verified - Updated -

Issue

  • What is fencing and why is it important?
  • Why is fencing a requirement for a RHEL cluster?
  • Is it possible to setup a cluster without fencing?
  • What problems might occur if I do not have fencing configured?
  • Our cluster node's motherboard failed, taking down the fence device as well. Fencing failed repeatedly, blocking all operations within the cluster. Why can't the cluster just try to fence for a short time and then if it can't reach the device, assume the node is dead and just move on without fencing it?

Environment

  • Red Hat Enterprise Linux (RHEL) 6 or 7 with the High Availability Or Resilient Storage Add On

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