Depending on the performance requirements of other structures in the coupling facility, you might want to change the coupling facility resource management policy in order to change the size of RACF® structures or relocate them to another coupling facility. A rebuild is necessary to implement policy changes. RACF supports the rebuild interface to do this. See z/OS MVS Programming: Sysplex Services Guide for information on the rebuild interface. See RACF support of the rebuild interface for information on RACF's support of the rebuild interface.