DFSMSrmm provides SMP/E USERMODs in SAMPLIB that you can apply to the standard JES3 user exits and other JES3 modules. Use EDG3UX71, EDG3UX29, and EDG3UX62 to set up DFSMSrmm with JES3. Install the USERMODs to prevent JES3 from validating certain volume mounts, to update JES3 fetch and mount messages, and to enable the use of no label tape volumes with JES3.

In a JES3 system, JES3 validates volume mounts when JES3 is managing tape drives and performing pre-processing setup. JES3 ensures that scratch tapes have reached their expiration date and that volumes are correctly write-enabled or protected. JES3 validation can conflict with DFSMSrmm and RACF processing. For example, you can use ‘logical write protect’ with IBM tape drives to prevent a user from writing to a tape even if the tape is physically write-enabled. Since DFSMSrmm ensures that all scratch tapes are valid and provides features to ignore the expiration dates on volumes, you might want to prevent JES3 from validating certain volume mounts.