To specify that a checkpoint data set resides on a Coupling facility structure, you must have taken the following steps when planning your JES2 configuration.

1. Format a Coupling facility resource management (CFRM) couple data set for use at your installation. See z/OS MVS Setting Up a Sysplex for specific instructions on defining the coupling facility resource management administrative policies. These policies each provide a number of with structures that can contain checkpoint data sets. Since JES2 supports system managed processes, you should also review the Coupling facilitiestopic "System-Managed Processes Considerations" in z/OS MVS Setting Up a Sysplex to enable system managed functions. We recommend that structure full monitoring be suppressed by setting a FULLTHRESHOLD value of 0 for the coupling facility structure where a checkpoint is to reside.
2. Ensure that you have allocated enough storage for the:
   • Coupling facilityStructure
   • JES2 checkpoint data set
   (To determine these sizes, see Determining the size of your checkpoint data set.)
3. Before starting the JES2 address space, specify the Coupling facility structure where a checkpoint is to reside on the CKPTDEF initialization statement as described in Checkpoint data set specifications and z/OS JES2 Initialization and Tuning Reference.