You can cause a deferred checkpoint/restart of a job by the following procedure:

1. Use the option of coding a special form of the RD parameter (RD=NR) in the original job. This specifies that, if the CHKPT macro instruction executes, a checkpoint entry is written but an automatic checkpoint/restart is not requested. Omission of RD=NR will not preclude a deferred checkpoint/restart.
2. Cause execution of the CHKPT macro instruction, which writes checkpoint entry.
3. Resubmit the job whether or not it terminated abnormally. For example, resubmit it because a volume of one of its input data sets was in error and had caused the corresponding part of an output data set to be in error.
4. Code the RESTART parameter (RESTART=(stepname,checkid)) on the JOB statement of the restart job. The parameter specifies both the step to be restarted and the checkid that identifies the checkpoint entry to perform the restart.
5. Place a SYSCHK DD statement immediately before the first EXEC statement in the restart job. It specifies the checkpoint data set from which the specified checkpoint entry is read and is additional to any DD statements in the job that define data sets into which checkpoint entries are written. Figure 1 illustrates a job when it is originally submitted and when it is resubmitted for a deferred checkpoint/restart. Assume in Figure 1 that STEP2, when originally executed, terminates abnormally at some time after CH04 is written. In the resubmitted job, you request that STEP2 be restarted using the checkpoint entry identified as entry CH04.
6. The DD statement VOL=REF parameter is ignored if restart is attempted from a checkpoint taken when the DD statements are opened out of order and the referenced DD statement requested nonspecific tape volumes.

          Original Job

//MYJOB  JOB     RD=NR                  Requests that
//*                                     automatic restart not
//*                                     occur (optional)
//STEP1  EXEC
                 .
                 .
                 .
//STEP2  EXEC    PGM=MYPROG             MYPROG issues CHKPT
//*                                     macro
//*
//NAME1  DD      DSN=NAME2,DISP=(,CATLG,KEEP)...
//*                                     Describes checkpoint
//*                                     data set
                 .
                 .
                 .
//STEP3  EXEC

          Resubmitted Job

//MYJOB  JOB     RESTART=(STEP2,CH04)   Request restart at
//*                                     CH04 in STEP2
//SYSCHK DD      DSN=NAME2,DISP=OLD     Describes data set
//*                                     that contains CH04
//STEP1  EXEC
                 .
                 .
                 .
//STEP2  EXEC    PGM=MYPROG
//NAME1  DD      DSN=NAME2,DISP=(,CATLG,KEEP)...
//*                                     Describes data set
//*                                     in which new
//*                                     checkpoint entries
//*                                     will be written
                 .
                 .
                 .
//STEP3  EXEC