When restart at a checkpoint occurs, a SYSIN data set (data following a DD * or DD DATA statement) is repositioned. Unit record data sets are never repositioned. The checkpoint routine waits until all requested input/output operations are complete, then requests that the job entry subsystem save positioning information. When automatic restart occurs, the system keeps the SYSIN data of the job restarting. During the restart execution, the job can read data from the SYSIN data sets as it could during the original execution.

To perform deferred restart, you include any necessary SYSIN data in the resubmitted job.

Information about altering SYSIN data in a restart job is given under JCL Requirements and Restrictions on Automatic Restart.