FMM19199E The auxiliary volume master_volname of the remote mirror relationship has the change_volname change volume assigned, which does not exist.
Explanation
For a remote Global Mirror FlashCopy backup operation to be started, IBM Storage Protect Snapshot requires the remote mirroring auxiliary volumes to have a change volume assigned, which exists in the remote SAN Volume Controller system.
Operator response
Use the IBM SAN Volume Controller Storage Management GUI or command-line interface (SVC CLI) to fix the problem. Assign a dedicated volume as the change volume of the auxiliary volume.