What is fencing and why is it important in a RHEL High Availability cluster?

Updated 2015-02-08T02:36:10+00:00

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 Cluster Suite 4
  • Red Hat Enterprise Linux (RHEL) 5, 6, or 7 with the High Availability Or Resilient Storage Add On

Subscriber content preview. For full access to the Red Hat Knowledgebase, please log in.

Not a subscriber? Learn more about the benefits of Red Hat Subscriptions.