IBM 887022X Maintenance Manual - Page 120

Hot-replace, DIMMs

Page 120 highlights

DIMM Retaining clip Figure 60. Inserting a DIMM into a DIMM slot Attention: If a gap exists between the DIMM and the retaining clips, the DIMM has not been properly installed. In this case, open the retaining clips and remove the DIMM; then, reinsert the DIMM. c. Repeat steps 9a and 9b for each DIMM. 10. Close the DIMM access door. 11. If necessary, reinstall either the top SMP Expansion Module or SMP baffle in the server. See "Installing the SMP Expansion Module and cover" on page 101 for instructions. 12. Close the top cover. 13. Slide the server into the rack enclosure until it stops; then, secure the server in the rack enclosure using the quick release latches. 14. Connect all external cables and turn on the server. Note: When you install or remove banks of DIMMs, the server configuration information changes. Therefore, you must change and save the new configuration information by using the Configuration/Setup Utility program (see "Starting the Configuration/Setup Utility program" on page 14). Hot-replace DIMMs This section includes the instructions needed to hot-replace DIMMs in the servers SMP Expansion Module with the power on. Notes: 1. Ensure that before you attempt to hot-replace a DIMM, the new DIMM is the same size and clock speed and that memory mirroring is enabled. 2. You can enable the hot-add and hot-replace memory features or you can enable the fastpath memory feature, but you cannot enable both at the same time. The fastpath memory feature increases memory performance. Attention: If two SMP Expansion Modules are installed in a server, you can not hot-replace or hot-add the DIMMs in the lowest SMP Expansion Module. In order to gain access to the DIMMs of a lower SMP Expansion Module, you must first remove the upper SMP Expansion Module which requires you to turn off the server. See "Removing and replacing DIMMs" on page 108 for information on how to remove and replace DIMMs while the server is turned off. 110 xSeries 445 Type 8870: Hardware Maintenance Manual and Troubleshooting Guide

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Attention:
If
a
gap
exists
between
the
DIMM
and
the
retaining
clips,
the
DIMM
has
not
been
properly
installed.
In
this
case,
open
the
retaining
clips
and
remove
the
DIMM;
then,
reinsert
the
DIMM.
c.
Repeat
steps
9a
and
9b
for
each
DIMM.
10.
Close
the
DIMM
access
door.
11.
If
necessary,
reinstall
either
the
top
SMP
Expansion
Module
or
SMP
baffle
in
the
server.
See
“Installing
the
SMP
Expansion
Module
and
cover”
on
page
101
for
instructions.
12.
Close
the
top
cover.
13.
Slide
the
server
into
the
rack
enclosure
until
it
stops;
then,
secure
the
server
in
the
rack
enclosure
using
the
quick
release
latches.
14.
Connect
all
external
cables
and
turn
on
the
server.
Note:
When
you
install
or
remove
banks
of
DIMMs,
the
server
configuration
information
changes.
Therefore,
you
must
change
and
save
the
new
configuration
information
by
using
the
Configuration/Setup
Utility
program
(see
“Starting
the
Configuration/Setup
Utility
program”
on
page
14).
Hot-replace
DIMMs
This
section
includes
the
instructions
needed
to
hot-replace
DIMMs
in
the
servers
SMP
Expansion
Module
with
the
power
on.
Notes:
1.
Ensure
that
before
you
attempt
to
hot-replace
a
DIMM,
the
new
DIMM
is
the
same
size
and
clock
speed
and
that
memory
mirroring
is
enabled.
2.
You
can
enable
the
hot-add
and
hot-replace
memory
features
or
you
can
enable
the
fastpath
memory
feature,
but
you
cannot
enable
both
at
the
same
time.
The
fastpath
memory
feature
increases
memory
performance.
Attention:
If
two
SMP
Expansion
Modules
are
installed
in
a
server,
you
can
not
hot-replace
or
hot-add
the
DIMMs
in
the
lowest
SMP
Expansion
Module.
In
order
to
gain
access
to
the
DIMMs
of
a
lower
SMP
Expansion
Module,
you
must
first
remove
the
upper
SMP
Expansion
Module
which
requires
you
to
turn
off
the
server.
See
“Removing
and
replacing
DIMMs”
on
page
108
for
information
on
how
to
remove
and
replace
DIMMs
while
the
server
is
turned
off.
DIMM
Retaining
clip
Figure
60.
Inserting
a
DIMM
into
a
DIMM
slot
110
xSeries
445
Type
8870:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide