CMMVC8571E The volume is already mapped as a subsidiary volume.
Explanation
An attempt was made to map a volume as a subsidiary volume, but the volume is already mapped as one. Subsidiary LUN mappings are typically created or removed by the IBM® Spectrum Control Base Edition application. These mappings apply only to adminlun host types, and so it is unlikely that a storage administrator would encounter this message.
User response
Contact IBM Support.