DFSMSrmm provides support for easier installation control over sharing a tape library dataserver. DFSMSrmm provides a cartridge entry installation exit that can be used to help partition volumes in a tape library dataserver across multiple sysplexes. This can include both VM and MVS platforms, as well as multiple SMSplexes. Support for partitioning with VM is provided based on volume naming convention, and at the individual volume level for volumes defined to DFSMSrmm on MVS. With a single tape configuration database (TCDB) across multiple MVS systems and complexes, a single DFSMSrmm control data set is typically used. With a single DFSMSrmm control data set, all volumes can be used on any or all systems with no partitioning possible. Then with carefully selected PRTITION and OPENRULE parameters for DFSMSrmm, you can also partition the tape library dataserver across multiple MVS systems. In doing so, there is typically one-to-one correspondence of tape configuration database TCDB to DFSMSrmm control data sets. You must use the DFSMSrmm facilities to ensure that a single volume is defined in only a single tape configuration database and a single DFSMSrmm control data set. See z/OS DFSMSrmm Implementation and Customization Guide for implementation details for these and any additional scenarios. Also refer to the IBM Redbook Guide to Sharing and Partitioning IBM Tape Library Dataservers.