How can I configure my RHEL 7 High Availabililty Cluster with pacemaker and corosync to maintain quorum after half of the nodes fail?

Solution Verified - Updated -

Issue

  • I have a four node cluster split across two racks, and if one rack completely fails then the other nodes are left without quorum. How can I solve this?
  • Is there a way to have half the nodes in a pacemaker cluster survive a failure of the other half?
  • Is there a way to allow one node in a 3 or more node cluster to operate without the other two?

Environment

  • Red Hat Enterprise Linux (RHEL) 7 with the High Availability Add On
  • pacemaker
  • corosync configured to use votequorum for quorum in /etc/corosync/corosync.conf
  • Cluster made up of an even number of nodes

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