Lenovo ThinkServer RD120 User Guide - Page 75

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DIMM 12 DIMM 11 Channel 3 DIMM 10 Branch 1 DIMM 9 DIMM 8 DIMM 7 DIMM 6 DIMM 5 DIMM 4 DIMM 3 DIMM 2 DIMM 1 Channel 2 Channel 1 Branch 0 Channel 0 v Each DIMM in a pair must be the same size, speed, type, and technology to ensure that the server will operate correctly. v You can configure the server to use memory mirroring. Memory mirroring stores data in two pairs of DIMMs simultaneously. If a failure occurs, the memory controller switches from the active pair to the mirroring pair. See "Memory mirroring" on page 62 for more information about memory mirroring and the DIMM installation sequence that is required. v The server supports online-spare memory. This feature disables the failed memory from the system configuration and activates an online-spare pair of DIMMs to replace the failed active DIMM pair. See "Online-spare memory" on page 63 for more information about online-spare memory and the DIMM configuration that is required. v You can enable either online-spare memory or memory mirroring, but not both at the same time. Online-spare memory provides more memory capacity than mirroring. Mirroring provides better memory protection but less memory capacity than online-spare memory. v When you install or remove DIMMs, the server configuration information changes. When you restart the server, the system displays a message that indicates that the memory configuration has changed. Note: When 4 GB or more of memory (physical or logical) is installed, some memory is reserved for various system resources and is unavailable to the operating system. The amount of memory that is reserved for system resources depends on the operating system, the configuration of the server, and the configured PCI options. Chapter 2. Installing optional devices 61

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DIMM 1
DIMM 2
DIMM 3
DIMM 4
DIMM 5
DIMM 6
DIMM 7
DIMM 8
DIMM 9
Channel 0
Channel 1
Channel 2
DIMM 10
DIMM 11
DIMM 12
Channel 3
Branch 1
Branch 0
v
Each
DIMM
in
a
pair
must
be
the
same
size,
speed,
type,
and
technology
to
ensure
that
the
server
will
operate
correctly.
v
You
can
configure
the
server
to
use
memory
mirroring.
Memory
mirroring
stores
data
in
two
pairs
of
DIMMs
simultaneously.
If
a
failure
occurs,
the
memory
controller
switches
from
the
active
pair
to
the
mirroring
pair.
See
“Memory
mirroring”
on
page
62
for
more
information
about
memory
mirroring
and
the
DIMM
installation
sequence
that
is
required.
v
The
server
supports
online-spare
memory.
This
feature
disables
the
failed
memory
from
the
system
configuration
and
activates
an
online-spare
pair
of
DIMMs
to
replace
the
failed
active
DIMM
pair.
See
“Online-spare
memory”
on
page
63
for
more
information
about
online-spare
memory
and
the
DIMM
configuration
that
is
required.
v
You
can
enable
either
online-spare
memory
or
memory
mirroring,
but
not
both
at
the
same
time.
Online-spare
memory
provides
more
memory
capacity
than
mirroring.
Mirroring
provides
better
memory
protection
but
less
memory
capacity
than
online-spare
memory.
v
When
you
install
or
remove
DIMMs,
the
server
configuration
information
changes.
When
you
restart
the
server,
the
system
displays
a
message
that
indicates
that
the
memory
configuration
has
changed.
Note:
When
4
GB
or
more
of
memory
(physical
or
logical)
is
installed,
some
memory
is
reserved
for
various
system
resources
and
is
unavailable
to
the
operating
system.
The
amount
of
memory
that
is
reserved
for
system
resources
depends
on
the
operating
system,
the
configuration
of
the
server,
and
the
configured
PCI
options.
Chapter
2.
Installing
optional
devices
61