When a job or subsystem hang occurs, you might notice part of the
system is not functioning or that a job is in the system for a long
time without processing.
Symptom of a job hang: - A job remains in the system for a long time and does not end.
Symptom of a subsystem hang: - A subsystem does not respond to any commands. For example, in
a JES2 system, enter a $DI1 command and JES2 does not respond.