HWN021530E The Volume - Port mapping can not be created. There are existing mappings that prevent this combination. VolumeCOP: The ID of the volume , Port: The WWPN of the port that should be mapped to the volume

Explanation

For FAStT it is not possible to merge existing mappings. That means, if you have volume A mapped to port 1, and volume B mapped to port 2, you will neither be able to map port 1 to volume B, nor port 2 to volume A.

Action

Build up mappings beginning with one volume-port mapping, and then add further volumes and ports. For Example, first map volume A and port 1, then volume A and port 2, finally volume B and port1 or port 2. The volume will be mapped to both ports. See also documentation for details.