IBM 84885BU User Manual - Page 21

Diagnostics

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Chapter 3. Diagnostics This chapter provides basic troubleshooting information to help solve some common problems that might occur with the server. If you cannot locate and correct the problem using the information in this section, see Appendix A, "Getting help and technical assistance," on page 141 for more information. General checkout Follow the checkout procedure for diagnosing hardware problems. Review the following information before performing the checkout procedure: v Read Appendix B, "Safety information," on page 143. v The server diagnostic programs are stored on the IBM Enhanced Diagnostics CD. These programs provide the primary methods of testing the major components of the server. If you are not sure whether a problem is caused by the hardware or by the software, you can run the diagnostic programs to confirm that the hardware is working correctly. v When you run the diagnostic programs, a single problem might cause several error messages. If you receive several error messages, correct the cause of the first error message. The other error messages might not occur the next time you run the diagnostic programs. v Before running the diagnostic programs, you must determine whether the failing server is part of a shared hard disk drive cluster (two or more servers sharing external storage devices). If you suspect that it is part of a cluster, you can run all diagnostic programs except the ones that test the storage unit (that is, a hard disk drive in the storage unit) or the storage adapter that is attached to the storage unit. The failing server might be part of a cluster if any of the following conditions is true: - The customer identifies the failing server as part of a cluster. - One or more external storage units are attached to the failing server and at least one of the attached storage units is also attached to another server or unidentifiable device. - One or more servers are located near the failing server. v Important: 1. For servers that are part of a shared hard disk drive cluster, run one test at a time. Do not run any suite of tests, such as "quick" or "normal" tests, because this could enable the hard disk drive diagnostic tests. 2. If more than one error code is displayed, correct the first error. The other error codes might not occur the next time you run the diagnostic programs. 3. If the server is suspended and a POST error code is displayed, see "POST error codes" on page 99. 4. If the server is suspended and no error message is displayed, see "Error symptoms" on page 109 and "Undetermined problems" on page 127. 5. For information about power-supply problems, see "Power checkout" on page 21. 6. For intermittent problems, check the error log; see "Diagnostic programs, error codes, and messages" on page 14. © Copyright IBM Corp. 2004 11

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Chapter
3.
Diagnostics
This
chapter
provides
basic
troubleshooting
information
to
help
solve
some
common
problems
that
might
occur
with
the
server.
If
you
cannot
locate
and
correct
the
problem
using
the
information
in
this
section,
see
Appendix
A,
“Getting
help
and
technical
assistance,”
on
page
141
for
more
information.
General
checkout
Follow
the
checkout
procedure
for
diagnosing
hardware
problems.
Review
the
following
information
before
performing
the
checkout
procedure:
v
Read
Appendix
B,
“Safety
information,”
on
page
143.
v
The
server
diagnostic
programs
are
stored
on
the
IBM
Enhanced
Diagnostics
CD
.
These
programs
provide
the
primary
methods
of
testing
the
major
components
of
the
server.
If
you
are
not
sure
whether
a
problem
is
caused
by
the
hardware
or
by
the
software,
you
can
run
the
diagnostic
programs
to
confirm
that
the
hardware
is
working
correctly.
v
When
you
run
the
diagnostic
programs,
a
single
problem
might
cause
several
error
messages.
If
you
receive
several
error
messages,
correct
the
cause
of
the
first
error
message.
The
other
error
messages
might
not
occur
the
next
time
you
run
the
diagnostic
programs.
v
Before
running
the
diagnostic
programs,
you
must
determine
whether
the
failing
server
is
part
of
a
shared
hard
disk
drive
cluster
(two
or
more
servers
sharing
external
storage
devices).
If
you
suspect
that
it
is
part
of
a
cluster,
you
can
run
all
diagnostic
programs
except
the
ones
that
test
the
storage
unit
(that
is,
a
hard
disk
drive
in
the
storage
unit)
or
the
storage
adapter
that
is
attached
to
the
storage
unit.
The
failing
server
might
be
part
of
a
cluster
if
any
of
the
following
conditions
is
true:
–
The
customer
identifies
the
failing
server
as
part
of
a
cluster.
–
One
or
more
external
storage
units
are
attached
to
the
failing
server
and
at
least
one
of
the
attached
storage
units
is
also
attached
to
another
server
or
unidentifiable
device.
–
One
or
more
servers
are
located
near
the
failing
server.
v
Important:
1.
For
servers
that
are
part
of
a
shared
hard
disk
drive
cluster,
run
one
test
at
a
time.
Do
not
run
any
suite
of
tests,
such
as
“quick”
or
“normal”
tests,
because
this
could
enable
the
hard
disk
drive
diagnostic
tests.
2.
If
more
than
one
error
code
is
displayed,
correct
the
first
error.
The
other
error
codes
might
not
occur
the
next
time
you
run
the
diagnostic
programs.
3.
If
the
server
is
suspended
and
a
POST
error
code
is
displayed,
see
“POST
error
codes”
on
page
99.
4.
If
the
server
is
suspended
and
no
error
message
is
displayed,
see
“Error
symptoms”
on
page
109
and
“Undetermined
problems”
on
page
127.
5.
For
information
about
power-supply
problems,
see
“Power
checkout”
on
page
21.
6.
For
intermittent
problems,
check
the
error
log;
see
“Diagnostic
programs,
error
codes,
and
messages”
on
page
14.
©
Copyright
IBM
Corp.
2004
11