6027-752 [E] Lost membership in cluster clusterName.
Unmounting file systems.
Explanation
This node has lost membership in the cluster. Either GPFS is no longer available on enough
nodes to maintain quorum, or this node could not communicate with
other members of the quorum. This could be caused by a communications
failure between nodes, or multiple GPFS failures.
User response
See associated error logs on the failed nodes for
additional problem determination information.