IBM 88743RU User Guide - Page 46

Advanced, Setup, Memory, Settings, Mirroring, Enable

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The following notes describe the Active Memory features: v Memory mirroring enables you to improve the reliability of the memory in your server by creating a mirror of the data in memory port 1 and storing it in memory port 2. Note: For memory mirroring to work, you must have DIMMs of the same size and clock speed in both memory ports. Complete the following steps to enable memory mirroring: 1. Check your operating system documentation to make sure that it supports memory mirroring. 2. Install DIMMs of the same size and clock speed in the two memory ports. 3. Enable memory mirroring in the Configuration/Setup Utility program: a. Turn on the server and watch the monitor screen. b. When the message Press F1 for Configuration/Setup appears, press F1. c. From the Configuration/Setup Utility main menu, select Advanced Setup. d. Select Memory Settings. e. Select Memory Mirroring Settings. f. Enable the memory mirroring setting from within this window. g. Save 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 kept in the memory port 1 DIMMs, while a second copy is kept in the memory port 2 DIMMs. During the execution of the read command, the data is read from the DIMM with the least number of reported memory errors through memory scrubbing, which is enabled with memory mirroring. 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 memory mirroring to be enabled to work. 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 error is then reported so that preventive maintenance can be performed. Provided that there are enough good locations to enable the correct operation of the server, no further action is taken other than recording the error 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. 34 IBM System x3950 Type 8878 and System x3950 E Type 8879: User's Guide

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The
following
notes
describe
the
Active
Memory
features:
v
Memory
mirroring
enables
you
to
improve
the
reliability
of
the
memory
in
your
server
by
creating
a
mirror
of
the
data
in
memory
port
1
and
storing
it
in
memory
port
2.
Note:
For
memory
mirroring
to
work,
you
must
have
DIMMs
of
the
same
size
and
clock
speed
in
both
memory
ports.
Complete
the
following
steps
to
enable
memory
mirroring:
1.
Check
your
operating
system
documentation
to
make
sure
that
it
supports
memory
mirroring.
2.
Install
DIMMs
of
the
same
size
and
clock
speed
in
the
two
memory
ports.
3.
Enable
memory
mirroring
in
the
Configuration/Setup
Utility
program:
a.
Turn
on
the
server
and
watch
the
monitor
screen.
b.
When
the
message
Press
F1
for
Configuration/Setup
appears,
press
F1.
c.
From
the
Configuration/Setup
Utility
main
menu,
select
Advanced
Setup
.
d.
Select
Memory
Settings
.
e.
Select
Memory
Mirroring
Settings
.
f.
Enable
the
memory
mirroring
setting
from
within
this
window.
g.
Save
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
kept
in
the
memory
port
1
DIMMs,
while
a
second
copy
is
kept
in
the
memory
port
2
DIMMs.
During
the
execution
of
the
read
command,
the
data
is
read
from
the
DIMM
with
the
least
number
of
reported
memory
errors
through
memory
scrubbing,
which
is
enabled
with
memory
mirroring.
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
memory
mirroring
to
be
enabled
to
work.
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
error
is
then
reported
so
that
preventive
maintenance
can
be
performed.
Provided
that
there
are
enough
good
locations
to
enable
the
correct
operation
of
the
server,
no
further
action
is
taken
other
than
recording
the
error
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.
34
IBM
System
x3950
Type
8878
and
System
x3950
E
Type
8879:
User’s
Guide