Chapter
5.
Diagnostics
This
section
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
151
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
153.
v
The
server
diagnostic
programs
are
stored
in
electrically
erasable
programmable
read-only
memory
(EEPROM)
on
the
system
board
that
is
shared
with
the
BIOS
code.
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
(see
“Diagnostic
programs,
error
codes
and
messages”
on
page
91)
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
no
beep
or
more
than
one
beep
sounds,
see
“Beep
symptoms”
on
page
104
or
“No-beep
symptoms”
on
page
108.
4.
If
the
server
is
suspended
and
a
POST
error
code
is
displayed,
see
“POST
error
codes”
on
page
108.
5.
If
the
server
is
suspended
and
no
error
message
is
displayed,
see
“Error
symptoms”
on
page
122
and
“Undetermined
problems”
on
page
140.
©
Copyright
IBM
Corp.
2004,
2007
87
Summary of Contents for xSeries 236 8841
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