Advanced Topics › Control and Checkpoint File Considerations › How You Allocate Control and Checkpoint Files

How You Allocate Control and Checkpoint Files

You need to allocate DASD control files only if you are planning to use either DASDONLY or CTCDASD as your communication method.

You can use coupling facility structure control files in addition to or in place of DASD control files in communication environments that require DASD control files, such as the DASDONLY or CTCDASD communication methods.

You also need to allocate DASD checkpoint files, if either one of the following is true:

• You will be using the CTCONLY or XCF communication methods. These environments use the checkpoint file to track system status information.
• You will be using the REQUEUE feature of the ENQ Conflict Management Facility (ECMF). ECMF uses the checkpoint file to track job requeues across system starts and stops.