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Active
Memory
Active
Memory
is
an
IBM
feature
that
improves
the
reliability
of
memory
through
memory
mirroring,
memory
scrubbing,
and
the
Memory
ProteXion
feature.
Memory
scrubbing
and
Memory
ProteXion
Memory
scrubbing
tests
the
memory
at
regular
intervals
to
detect
and
report
potential
memory
errors
before
they
can
cause
server
outages.
If
a
detected
error
is
recoverable,
the
Memory
ProteXion
feature
corrects
the
error
and
rewrites
the
data
to
another
memory
location
on
the
same
DIMM.
The
error
is
logged
in
the
error
log
so
that
you
can
determine
whether
preventive
maintenance
is
necessary.
If
there
are
not
sufficient
undamaged
memory
locations
that
the
data
can
be
rewritten
to,
the
error
is
unrecoverable.
Other
conditions
can
also
cause
unrecoverable
errors.
If
a
detected
error
is
unrecoverable,
LEDs
on
the
Light
Path
Diagnostics
panel
are
lit
to
indicate
the
failing
DIMM.
You
do
not
have
to
enable
memory
mirroring
to
use
memory
scrubbing
and
the
Memory
ProteXion
feature.
Memory
mirroring
Memory
mirroring
stores
data
in
memory
port
1
and
memory
port
2
simultaneously.
To
support
memory
mirroring,
you
must
install
identical
dual
inline
memory
modules
(DIMMs)
in
memory
port
1
and
memory
port
2.
For
more
information,
see
the
section
about
installing
memory
modules
in
the
Option
Installation
Guide
on
the
IBM
xSeries
Documentation
CD.
To
enable
memory
mirroring
through
the
Configuration/Setup
Utility
program,
select
Advanced
Setup
from
the
main
menu,
and
then
select
Memory
Settings.
For
more
information
about
using
the
Configuration/Setup
Utility
program,
see
Chapter
2,
“Configuring
the
server,”
on
page
17.
When
memory
mirroring
is
enabled,
BIOS
will
only
report
half
of
the
installed
memory.
For
example,
if
you
have
64
GB
of
memory
installed
and
memory
mirroring
is
enabled,
BIOS
will
only
report
32
GB
of
memory.
Note:
To
use
the
hot-add
memory
feature,
memory
mirroring
must
be
disabled
in
the
BIOS
code.
The
UpdateXpress
program
The
UpdateXpress
program
is
available
for
most
xSeries
servers
and
server
options.
It
detects
supported
and
installed
device
drivers
and
firmware
in
your
server
and
installs
available
updates.
You
can
download
the
UpdateXpress
program
from
the
Web
at
no
additional
cost,
or
you
can
purchase
it
on
a
CD.
To
download
the
program
or
purchase
the
CD,
go
to
http://www.ibm.com/pc/ww/eserver/xseries/serverguide/xpress.html.
Chapter
1.
Introducing
the
IBM
xSeries
445
server
7