You can use the system restart function to:
- Restart the system after you have entered a QUIESCE command. (See Quiescing the system.)
- Restart the system from a restartable wait state that is specified in z/OS MVS System Codes.
- Restart the system when it behaves abnormally and you cannot terminate the suspected unit of work
with the CANCEL or FORCE commands. A system behaving abnormally may
be one that enters a nonvalid wait state or a disabled loop. A nonvalid
wait state exists when the wait state code in the PSW (IC) is not
listed in z/OS MVS System Codes and is not in the range of wait state codes (FF0-FFE) reserved
for other authorized applications. Symptoms of a disabled loop are:
- Nonproductive processing occurs and the PSW (IC) frequently displays
the same addresses.
- All I/O and external interrupts are masked off for the system.