Handling checkpoint/restart data set problems
AR/CTL uses a VSAM linear data set to store the restart and repositioning information for a job step. This data set is called the checkpoint data set when AR/CTL writes checkpoint records to it during job step execution. It is called the restart data set when AR/CTL reads records from it during job step restart. The checkpoint/restart data set is essential to AR/CTL operations. It is possible for this data set to experience an out-of-space condition or destruction through hardware failure or accidental deletion. This section describes these problems and procedures for solving them.
If AR/CTL is unable to allocate the checkpoint data set during normal/cold start, correct the allocation problem and submit the job step as it was originally submitted. Because application program processing does not occur until after AR/CTL allocates the checkpoint data set, job step status remains as it was at the first submission.
If AR/CTL cannot allocate the restart data set during restart, use the procedure described in Handling-a-destroyed-or-damaged-checkpoint-restart-data-set.