To perform a deferred checkpoint/restart, you resubmit in an input job stream the job to be restarted. Messages that contain checkpoint entry identifications are displayed on the console during the original execution of the job and thus can be used by the programmer preparing the job for resubmission. When the resubmitted job is restarted, messages appear on the console in the following sequence:

1. A message asking if the checkpoint data set that is being used for restart is a secure volume.
   • For Tape Library Dataserver tape library devices, the tape library configuration data base will be read for confirmation of a secure checkpoint volume.
2. If additional checkpoint data sets, other than the data set used for restart, are encountered at restart time, checkpoint data set security messages are issued.
3. A message indicating the virtual storage requirements of the job.
4. Normal mount messages.
5. If password-protected data sets are to be repositioned at restart time, a password message is issued.
6. A successful restart message.

To perform a deferred step restart, the job to be restarted is resubmitted. Normal mount messages are displayed.