IBM x3500 Installation Guide - Page 95

Memory, problems

Get IBM x3500 - System - 7977 PDF manuals and user guides
UPC - 883436005760
View all IBM x3500 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 95 highlights

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 1. Make sure that: that is displayed is less than the amount of installed physical v No error LEDs are lit on the operator information panel or on the DIMM. memory. 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 4. 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 3 until you have tested all removed DIMMs. 4. (Trained service technician only) Replace the system board. Chapter 5. Solving problems 81

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
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
4.
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
3
until
you
have
tested
all
removed
DIMMs.
4.
(Trained
service
technician
only)
Replace
the
system
board.
Chapter
5.
Solving
problems
81