After you remove a Coordinator disk used by fencing or fencing disk group by running the vxdmpadm exclude dmpnodename=<dmp_disk/node> command, the removed disk is not listed in the vxfenconfig -l command output.

In case of a split brain, the vxfen program cannot use the removed disk as a coordination point in the subsequent fencing race.

Workaround: Run the vxdmpadm include dmpnodename=<dmp_disk/node> command to again enable the dmp disk. This disk will show up in subsequent vxfencondig -l output.