Operating System Problems; Performance Problems; Mpe System Hang; System Performance Symptoms And Solutions - HP 3000 Series Handbook

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Operating System Problems
Vvhen an operating system problem occurs, the first step is to determine the type of problem.
The first symptom of a problem is that the system does not respond to user input. This lack
of response indicates either a performance problem or a system interruption.
Performance problem The system responds to one or more programs/users, but the system
response is very slow.
System hang
There is a complete loss of CPU resources for all users/programs.
There is no system response over a long period of time.
Performance Problems
If the system seems to have a performance problem, use the recovery procedures in Table 5-14.
Table 5-14. System Performance Symptoms and Solutions
Symptoms Jlecovery Procedure
1. System responds to one or more 1. See if any active processes are making heavy
programs/users. use of computer resources. (For example, a
2. Other programs/users cannot seem to get a
massive compilation or a real time process.)
response.
2.
Try sending an interrupt
((COfit!Of}©)
at a
3. System seems slow. terminal.
3. Check another terminal to verify that the
problem is not just a console hang.
MPE System Hang
Table 5-15 lists the symptoms and the recovery procedure.
Table 5-15. System Hang Symptoms and Solutions
Symptoms Recovery Procedure
1. The machine is running (the green RUN light 1. Halt the machine by issuing a "TC"
is lit), but no one can access the system. command. (Do NOT do a "=SHUTDOWN"
2. The system console may or may not be hung.
command first. Do NOT use the "RS"
3. The Control-A("=" prompt) may or may command. Either of these commands may
not be functioning.
destroy important troubleshooting
4.
The hex display typically displays one of two information.)
possible states: 2. Take a memory dump.
a. FOFF /FFFF (the hex display alternates
3. Restart the system as soon as the dump is
between FOFF and FFFF), finished.
b. FAFF /FFFF (the hex display alternates
between FAFF and FFFF).
5-20 Troubleshooting