IBM Type 7977 사용자 설명서
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
Problem
Determination
and
Service
Guide
on
the
IBM
System
x
Documentation
CD
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
DIMM.
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.
Make
sure
that
there
is
no
memory
mismatch
when
the
server
is
at
the
minimum
memory
configuration.
4.
Add
one
pair
of
DIMMs
at
a
time,
making
sure
that
the
DIMMs
in
each
pair
are
matching.
5.
Reseat
the
DIMMs.
6.
Replace
the
DIMMs,
one
at
a
time,
restarting
the
server
each
time.
Multiple
rows
of
DIMMs
in
a
branch
are
identified
as
failing.
1.
Reseat
the
DIMMs;
then,
restart
the
server.
2.
Replace
the
lowest-numbered
pair
of
DIMMs
with
an
identical
known
good
pair
of
DIMMs;
then,
restart
the
server.
Repeat
as
necessary.
If
the
failures
continue
after
all
identified
pairs
are
replaced,
go
to
3.
Return
the
removed
DIMMs,
one
pair
at
a
time,
to
their
original
connectors,
restarting
the
server
after
each
pair,
until
pair
fails.
Replace
each
DIMM
in
the
failed
pair
with
an
identical
known
good
DIMM,
restarting
the
server
after
each
DIMM.
Replace
the
failed
DIMM.
Repeat
step
until
you
have
tested
all
removed
DIMMs.
4.
(Trained
service
technician
only)
Replace
the
system
board.
Chapter
5.
Solving
problems
81