In configurations where a single cached storage subsystem is attached to multiple host systems (running either in separate processors or separate logical partitions), any DFSMS/MVS or z/OS® system can exploit concurrent copy. Although systems that are not running DFSMS/MVS or z/OS cannot initiate concurrent copy operations, such systems can share a cached storage subsystem (including volumes with active concurrent copy sessions) with DFSMS/MVS or z/OS systems provided that the non-DFSMS/MVS or z/OS systems support 32-byte sense information.