During processing related to an automatic checkpoint/restart, the system issues the following sequence of messages to the operator:

1. A message is issued each time a checkpoint entry is written. Each message contains the checkpoint identification.
2. If the job step terminates because of an abend condition, an abend message is issued for the job step.
3. If the abend code makes the job step eligible for restart and a job journal is present, an authorization for restart message (IEF225D) is issued that requires a reply.
4. A message is issued, indicating the virtual storage requirements (beginning address and ending address) of the job step to be restarted.
5. Normal mount and restart messages are issued, except when using the Tape Library Dataserver.
6. If password-protected data sets are to be repositioned at restart time, a password message is issued.
7. 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.
8. A successful restart message is issued.

During processing related to an automatic step restart after a job step has terminated abnormally, the system issues the following sequence of messages to the operator.

1. An abend message is issued for the job step.
2. If the abend code makes the job step eligible for restart, and a job journal is present, an authorization message is issued that requires a reply.
3. Normal mount messages are issued.

   IEF4501 jobname.stepname.procstepname. ABEND code

is always displayed if a job step terminates abnormally. In addition, if the job step is being executed and the system fails, this message will be displayed during the next IPL if a system-supported restart is performed. The code part of the message has the form Shhh (S followed by a 3-character hexadecimal number) if the system executed the abend macro instruction, or Udddd (U followed by a 4-digit decimal number) if your program executed the abend. It is S2F3 if a system failure occurred. For more information about messages see z/OS MVS System Messages, Vol 1 (ABA-AOM), z/OS MVS System Messages, Vol 2 (ARC-ASA), z/OS MVS System Messages, Vol 3 (ASB-BPX), z/OS MVS System Messages, Vol 4 (CBD-DMO), z/OS MVS System Messages, Vol 5 (EDG-GFS), z/OS MVS System Messages, Vol 6 (GOS-IEA), z/OS MVS System Messages, Vol 7 (IEB-IEE), z/OS MVS System Messages, Vol 8 (IEF-IGD), z/OS MVS System Messages, Vol 9 (IGF-IWM), and z/OS MVS System Messages, Vol 10 (IXC-IZP).