For
HP
Internal Use Only
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
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