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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