IBM 72335LU User Guide - Page 51

Adding, replacing, memory

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e. Select Memory Mirroring Settings. f. Enable the memory mirroring setting from within this window. g. Save the settings and exit the Configuration/Setup Utility program. When memory mirroring is enabled, the data that is written to memory is stored in two locations. One copy is stored in the memory port 1 DIMMs, and a second copy is stored in the memory port 2 DIMMs. During a read operation, the data is read from the DIMM with the fewest reported memory errors through memory scrubbing. If memory scrubbing determines that a DIMM is damaged beyond use, read and write operations are redirected to the remaining good DIMMs. Memory scrubbing then reports the damaged DIMM, and light path diagnostics displays the error. After the damaged DIMM is replaced, memory mirroring then copies the mirrored data back into the new DIMM. v Memory scrubbing is an automatic daily test of all the system memory that detects and reports memory errors that might be developing before they cause a server outage. Note: Memory scrubbing and Memory ProteXion technology work with each other and do not require that memory mirroring be enabled. When an error is detected, memory scrubbing determines whether the error is recoverable. If it is recoverable, Memory ProteXion is enabled, and the data that was stored in the damaged locations is rewritten to a new location. The event is logged for informational purposes. Provided that there are enough good locations to enable the correct operation of the server, no further action is taken other than recording the event in the error logs. If the error is not recoverable, memory scrubbing sends an error message to light path diagnostics, which lights LEDs to guide you to the damaged DIMM. If memory mirroring is enabled, the mirrored copy of the data in the mirrored DIMM is used to refresh the new DIMM after it is installed. 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. Adding and replacing a memory card At least one memory card with one pair of DIMMs must be installed for the server to operate correctly. Adding a memory card To add a memory card, complete the following steps: 1. Read the safety information that begins on page v and "Installation guidelines" on page 26. 2. Turn off the server and peripheral devices, and disconnect the power cords and all external cables as necessary to replace the device. 3. Remove the server cover (see "Removing the cover and bezel" on page 28). 4. Prepare the memory card: a. Touch the static-protective package that contains 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-protective surface, with the DIMM connectors facing up. Chapter 2. Installing optional devices 39

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e.
Select
Memory
Mirroring
Settings
.
f.
Enable
the
memory
mirroring
setting
from
within
this
window.
g.
Save
the
settings
and
exit
the
Configuration/Setup
Utility
program.
When
memory
mirroring
is
enabled,
the
data
that
is
written
to
memory
is
stored
in
two
locations.
One
copy
is
stored
in
the
memory
port
1
DIMMs,
and
a
second
copy
is
stored
in
the
memory
port
2
DIMMs.
During
a
read
operation,
the
data
is
read
from
the
DIMM
with
the
fewest
reported
memory
errors
through
memory
scrubbing.
If
memory
scrubbing
determines
that
a
DIMM
is
damaged
beyond
use,
read
and
write
operations
are
redirected
to
the
remaining
good
DIMMs.
Memory
scrubbing
then
reports
the
damaged
DIMM,
and
light
path
diagnostics
displays
the
error.
After
the
damaged
DIMM
is
replaced,
memory
mirroring
then
copies
the
mirrored
data
back
into
the
new
DIMM.
v
Memory
scrubbing
is
an
automatic
daily
test
of
all
the
system
memory
that
detects
and
reports
memory
errors
that
might
be
developing
before
they
cause
a
server
outage.
Note:
Memory
scrubbing
and
Memory
ProteXion
technology
work
with
each
other
and
do
not
require
that
memory
mirroring
be
enabled.
When
an
error
is
detected,
memory
scrubbing
determines
whether
the
error
is
recoverable.
If
it
is
recoverable,
Memory
ProteXion
is
enabled,
and
the
data
that
was
stored
in
the
damaged
locations
is
rewritten
to
a
new
location.
The
event
is
logged
for
informational
purposes.
Provided
that
there
are
enough
good
locations
to
enable
the
correct
operation
of
the
server,
no
further
action
is
taken
other
than
recording
the
event
in
the
error
logs.
If
the
error
is
not
recoverable,
memory
scrubbing
sends
an
error
message
to
light
path
diagnostics,
which
lights
LEDs
to
guide
you
to
the
damaged
DIMM.
If
memory
mirroring
is
enabled,
the
mirrored
copy
of
the
data
in
the
mirrored
DIMM
is
used
to
refresh
the
new
DIMM
after
it
is
installed.
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.
Adding
and
replacing
a
memory
card
At
least
one
memory
card
with
one
pair
of
DIMMs
must
be
installed
for
the
server
to
operate
correctly.
Adding
a
memory
card
To
add
a
memory
card,
complete
the
following
steps:
1.
Read
the
safety
information
that
begins
on
page
v
and
“Installation
guidelines”
on
page
26.
2.
Turn
off
the
server
and
peripheral
devices,
and
disconnect
the
power
cords
and
all
external
cables
as
necessary
to
replace
the
device.
3.
Remove
the
server
cover
(see
“Removing
the
cover
and
bezel”
on
page
28).
4.
Prepare
the
memory
card:
a.
Touch
the
static-protective
package
that
contains
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-protective
surface,
with
the
DIMM
connectors
facing
up.
Chapter
2.
Installing
optional
devices
39