DNZPHA520E: ERROR: no node was found within the specified cluster that this operation could be performed on.
Explanation: This operation must be run on an IBM PowerHA SystemMirror node, but no node was specified, nor could the controlling node be identified.
Operator Response: Specify the node to run this operation on.
Administrator Response: Make sure all the nodes in the cluster are active, and that there are no communications problems with the current controlling node.