If you choose to run this program to compact a volume on which a RACF® database resides, there are several ways of doing so:

• Designating the RACF data sets unmovable indicates that all the data sets for the RACF database are unmovable. Run DFSMSdss DEFRAG, which will compress the rest of the data on the volume, but will not alter the location of the RACF data sets.
• Issue RVARY, with the SWITCH or INACTIVE operand, to deactivate and deallocate the databases. Do this when other users or jobs are not on the system, because they might experience failures while the database is inactive. Next, run the DFSMSdss DEFRAG program to compress the volume. Last, reissue the RVARY command with either the SWITCH or ACTIVE operand to automatically reactivate and reallocate the databases. When you issue RVARY SWITCH or ACTIVE, the RACF control blocks that describe the physical location of the database are rebuilt.

  For a more detailed description of the RVARY command, see z/OS Security Server RACF Command Language Reference and The RVARY command.

• If you cannot make the RACF database unmovable, and you want to run DEFRAG with the database active, you must use the EXCLUDE operand on the DFSMSdss control statements to explicitly exclude the RACF database from being moved during the DEFRAG operation.