You must establish the dispatching priority of the RRS address space. The best way to control RRS's dispatching priority is through the workload manager (WLM). IBM® recommends that you put RRS in the SYSSTC service class. The service class you choose must give RRS a dispatching priority greater than or equal to the dispatching priority of applications and resource managers that use RRS. SYSSTC will usually accomplish this. For information about system-provided service classes, see z/OS MVS Planning: Workload Management.