Why is UDP unicast (UDPU) not recommended for use in a cluster with GFS2 in a RHEL 6 or 7 Resilient Storage cluster?

Solution Verified - Updated -

Issue

  • IP multicast is disabled in my environment, but I want to create a GFS2 cluster.
  • I want to use udpu as it is an available alternative, but it is said that it is not recommended in a cluster that uses GFS2.

Environment

  • Red Hat Enterprise Linux (RHEL) 6 Update 2 or higher or RHEL 7 with the Resilient Storage Add-on
  • GFS2
  • UDPU transport in use
    • RHEL 6: <cman transport="udpu"/> in `/etc/cluster/cluster.conf
    • RHEL 7: totem { transport: udpu } in /etc/corosync/corosync.conf

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