SYSCKEOV DD Statement

The SYSCKEOV DD statement defines the checkpoint data set to contain the checkpoint records generated from the checkpoint at end-of-volume. The same restrictions that apply to other checkpoint DD statements (see Coding the DD Statement for a Checkpoint Data Set) also apply to this DD statement, with the following exceptions:

• DISP=MOD is recommended to reduce risk of loss of checkpoint data in the event of a system failure while taking a checkpoint. This is because restart normally is from the most recent checkpoint in the data set. If you do not code DISP=MOD, each checkpoint overlays the previous one. See How Checkpoint Entries Are Written and How to Ensure Restart with Sequential Checkpoint Data Sets.
• This DD must define a sequential BSAM data set (BPAM is not supported)
• All the DCB parameters are provided by the checkpoint at EOV routine and should not be coded on the DD statement.

An example follows:

   //SYSCKEOV DD DSN=CKPTDS,UNIT=TAPE,DISP=MOD