IBM 88643RU Service Guide - Page 57

Removing, replacing, memory

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v Memory ProteXion reassigns memory bits to new locations within memory when recoverable errors have been detected. When a recoverable error is found by memory scrubbing, the Memory ProteXion feature writes the data that was to be stored in the damaged memory locations to spare memory locations within the same DIMM. Removing and replacing a memory card At least one memory card with one pair of DIMMs must be installed for the server to operate correctly. Replacing a memory card: Complete the following steps to replace a memory card: 1. Read the safety information that begins on page vii, and "Handling static-sensitive devices" on page 31. 2. Turn off the server and peripheral devices, and disconnect the power cords and all external cables necessary to replace the device. 3. Remove the cover from the server (see "Removing the cover and bezel" on page 31). 4. Prepare the new memory card to go into the server: a. Touch the static protective package containing the memory card to any unpainted surface on the outside of the server. Then, remove the memory card from the package. b. Place the memory card on a flat, static protected surface with the DIMM connectors facing up. c. Install memory DIMMs in the memory card (see "Installing memory modules" on page 42). 5. Remove the memory card from the server: a. Make sure that the retention levers on the edge of the memory card are fully open. b. Lift the memory card out of the server and set it aside. 6. Replace the memory card: a. Grasp the new memory card by the retention levers and turn the memory card so that the connector aligns with the connector on the microprocessor board. b. Insert the memory card into the memory card connector. c. Press the memory card into the connector and close the retention levers. 7. Reconnect external cables and power cords. Hot-replacing a memory card: To hot-replace a memory card memory mirroring must be enabled. See "Active Memory" on page 40 for information on how to enable memory mirroring. Complete the following steps to hot-replace a memory card in the server: Attention: Static electricity that is released to internal server components when the server is powered-on might cause the server to halt, which could result in the loss of data. To avoid this potential problem, always use an electrostatic-discharge wrist strap or other grounding system when working inside the server with the power on. 1. Read the safety information beginning on page v and "Installation guidelines" on page 29. Chapter 4. Removing and replacing server components 41

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v
Memory
ProteXion
reassigns
memory
bits
to
new
locations
within
memory
when
recoverable
errors
have
been
detected.
When
a
recoverable
error
is
found
by
memory
scrubbing,
the
Memory
ProteXion
feature
writes
the
data
that
was
to
be
stored
in
the
damaged
memory
locations
to
spare
memory
locations
within
the
same
DIMM.
Removing
and
replacing
a
memory
card
At
least
one
memory
card
with
one
pair
of
DIMMs
must
be
installed
for
the
server
to
operate
correctly.
Replacing
a
memory
card:
Complete
the
following
steps
to
replace
a
memory
card:
1.
Read
the
safety
information
that
begins
on
page
vii,
and
“Handling
static-sensitive
devices”
on
page
31.
2.
Turn
off
the
server
and
peripheral
devices,
and
disconnect
the
power
cords
and
all
external
cables
necessary
to
replace
the
device.
3.
Remove
the
cover
from
the
server
(see
“Removing
the
cover
and
bezel”
on
page
31).
4.
Prepare
the
new
memory
card
to
go
into
the
server:
a.
Touch
the
static
protective
package
containing
the
memory
card
to
any
unpainted
surface
on
the
outside
of
the
server.
Then,
remove
the
memory
card
from
the
package.
b.
Place
the
memory
card
on
a
flat,
static
protected
surface
with
the
DIMM
connectors
facing
up.
c.
Install
memory
DIMMs
in
the
memory
card
(see
“Installing
memory
modules”
on
page
42).
5.
Remove
the
memory
card
from
the
server:
a.
Make
sure
that
the
retention
levers
on
the
edge
of
the
memory
card
are
fully
open.
b.
Lift
the
memory
card
out
of
the
server
and
set
it
aside.
6.
Replace
the
memory
card:
a.
Grasp
the
new
memory
card
by
the
retention
levers
and
turn
the
memory
card
so
that
the
connector
aligns
with
the
connector
on
the
microprocessor
board.
b.
Insert
the
memory
card
into
the
memory
card
connector.
c.
Press
the
memory
card
into
the
connector
and
close
the
retention
levers.
7.
Reconnect
external
cables
and
power
cords.
Hot-replacing
a
memory
card:
To
hot-replace
a
memory
card
memory
mirroring
must
be
enabled.
See
“Active
Memory”
on
page
40
for
information
on
how
to
enable
memory
mirroring.
Complete
the
following
steps
to
hot-replace
a
memory
card
in
the
server:
Attention:
Static
electricity
that
is
released
to
internal
server
components
when
the
server
is
powered-on
might
cause
the
server
to
halt,
which
could
result
in
the
loss
of
data.
To
avoid
this
potential
problem,
always
use
an
electrostatic-discharge
wrist
strap
or
other
grounding
system
when
working
inside
the
server
with
the
power
on.
1.
Read
the
safety
information
beginning
on
page
v
and
“Installation
guidelines”
on
page
29.
Chapter
4.
Removing
and
replacing
server
components
41