If you use DFSMSrmm and have JES3-managed tape devices that are not in an automated tape library, continue with this step. Otherwise, skip this step because allocation and DFSMSdfp handle all mount and volume verification.

DFSMSrmm provides SMP/E USERMODs that you can apply to the standard supplied JES3 user exits and other JES3 modules. The USERMODs can be used 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. If you have installed DFSMSrmm on a JES3 system, you might want to apply the JES3 USERMODs as described in Running DFSMSrmm with JES3. You must consider how applying a USERMOD might affect any locally-developed user exits.