CMMVC9202E The task failed because the volume is part of a Metro Mirror or Global Mirror relationship to a system which is running software which does not support resize of volumes in a relationship.
Explanation
You can change the size of the volumes that are part of Metro Mirror or Global Mirror relationships only if both systems involved in that relationship are running software that supports the resizing function.
User response
Either upgrade the remote system or remove the Metro Mirror or Global Mirror relationship, then retry the command.