IBM 8874 Installation Guide - Page 77

Memory, problems

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Memory problems v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See the parts listing in the Problem Determination and Service Guide to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU). v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a trained service technician. Symptom Action The amount of system memory 1. Make sure that: that is displayed is less than the amount of installed physical memory. v No error LEDs are lit on the operator information panel or on the memory card. v Memory mirroring does not account for the discrepancy. v The memory modules are seated correctly. v You have installed the correct type of memory. v If you changed the memory, you updated the memory configuration in the Configuration/Setup Utility program. v All banks of memory are enabled. The server might have automatically disabled a memory bank when it detected a problem, or a memory bank might have been manually disabled. 2. Check the POST error log for error message 289: v If a DIMM was disabled by a system-management interrupt (SMI), replace the DIMM. v If a DIMM was disabled by the user or by POST, run the Configuration/Setup Utility program and enable the DIMM. 3. Run memory diagnostics. 4. Make sure there is no memory mismatch when the server is at the minimum memory configuration. 5. Add one pair of DIMMs at a time, making sure the DIMMs match for each pair added. 6. Add one memory card at a time, making sure the memory matches for each card added. 7. Reseat the following components: a. DIMM b. Memory card 8. Replace the components listed in step 7 one at a time, in the order shown, restarting the server each time. Chapter 6. Solving problems 65

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Memory
problems
v
Follow
the
suggested
actions
in
the
order
in
which
they
are
listed
in
the
Action
column
until
the
problem
is
solved.
v
See
the
parts
listing
in
the
Problem
Determination
and
Service
Guide
to
determine
which
components
are
customer
replaceable
units
(CRU)
and
which
components
are
field
replaceable
units
(FRU).
v
If
an
action
step
is
preceded
by
“(Trained
service
technician
only),”
that
step
must
be
performed
only
by
a
trained
service
technician.
Symptom
Action
The
amount
of
system
memory
that
is
displayed
is
less
than
the
amount
of
installed
physical
memory.
1.
Make
sure
that:
v
No
error
LEDs
are
lit
on
the
operator
information
panel
or
on
the
memory
card.
v
Memory
mirroring
does
not
account
for
the
discrepancy.
v
The
memory
modules
are
seated
correctly.
v
You
have
installed
the
correct
type
of
memory.
v
If
you
changed
the
memory,
you
updated
the
memory
configuration
in
the
Configuration/Setup
Utility
program.
v
All
banks
of
memory
are
enabled.
The
server
might
have
automatically
disabled
a
memory
bank
when
it
detected
a
problem,
or
a
memory
bank
might
have
been
manually
disabled.
2.
Check
the
POST
error
log
for
error
message
289:
v
If
a
DIMM
was
disabled
by
a
system-management
interrupt
(SMI),
replace
the
DIMM.
v
If
a
DIMM
was
disabled
by
the
user
or
by
POST,
run
the
Configuration/Setup
Utility
program
and
enable
the
DIMM.
3.
Run
memory
diagnostics.
4.
Make
sure
there
is
no
memory
mismatch
when
the
server
is
at
the
minimum
memory
configuration.
5.
Add
one
pair
of
DIMMs
at
a
time,
making
sure
the
DIMMs
match
for
each
pair
added.
6.
Add
one
memory
card
at
a
time,
making
sure
the
memory
matches
for
each
card
added.
7.
Reseat
the
following
components:
a.
DIMM
b.
Memory
card
8.
Replace
the
components
listed
in
step
7
one
at
a
time,
in
the
order
shown,
restarting
the
server
each
time.
Chapter
6.
Solving
problems
65