IBM 9228 User Guide - Page 61

input/output

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resources. The basic input/output system (BIOS) displays the total amount of installed memory and the amount of configured memory. v The DIMM options that are available for the computer are 512 MB, 1 GB, 2 GB, and 4 GB, which come in matched pairs. The computer supports a minimum of 1GB and a maximum of 32 GB of system memory. v The memory controller has four fully buffered DIMM channels that are organized into two branches. Each branch has two channels, and each channel controls two DIMMs. DIMMs within the channels of a branch must be identical in size, type, speed, and technology. The following illustration shows how the memory controller is organized into branches and channels with two pairs of DIMMs installed. DIMM 2 DIMM 4 DIMM 6 DIMM 8 DIMM 1 DIMM 3 DIMM 5 DIMM 7 Channel 0 Channel 1 Branch 0 Channel 2 Channel 3 Branch 1 Memory Controller Note: The DIMMs in the computer should be populated from the largest DIMM to the smallest DIMM (for example 2 GB, 1 GB, 512 MB). Populating DIMMs from the largest capacity to the smallest capacity will yield better performance, enabling the operating system to access more of the system memory before passing through the advanced memory buffer (AMB) to access the second DIMM on the channel. v The computer can operate in two major modes, mirroring and non-mirroring (normal). The computer can also operate in a single-channel mode when one DIMM is installed. v The computer supports memory mirroring (mirroring mode) and online-spare memory. - Memory mirroring replicates data in two pairs of DIMMs simultaneously, this allows the computer to continue working if one set of DIMMs fail. When you use memory mirroring, consider the following information: - The memory is reduced to half the amount of memory available. For example, the maximum available memory is reduced from 32 GB to 16 GB in the mirroring mode. - The minimum memory configuration is four identical DIMMs. You must install identical pairs of DIMMs in all four DIMM connections (same size, type, speed, and technology). These DIMMs must span both branches and all four channels. For example, when you assign the first four DIMMs, you must install two DIMMs in branch 0 (one in channel 0 and one in channel 1) and two DIMMs in branch 1 (one in channel 2 and one in channel 3). See the following table for the installation sequence for operating in the mirroring mode. - When you upgrade the computer to eight DIMMs, the DIMMs in both branches must be identical (same size, type, speed, and technology). - Both branches operate in dual-channel mode. The following table shows the DIMM configuration upgrade sequence (mirroring mode). Chapter 4. Installing options 49

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resources.
The
basic
input/output
system
(BIOS)
displays
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory.
v
The
DIMM
options
that
are
available
for
the
computer
are
512
MB,
1
GB,
2
GB,
and
4
GB,
which
come
in
matched
pairs.
The
computer
supports
a
minimum
of
1GB
and
a
maximum
of
32
GB
of
system
memory.
v
The
memory
controller
has
four
fully
buffered
DIMM
channels
that
are
organized
into
two
branches.
Each
branch
has
two
channels,
and
each
channel
controls
two
DIMMs.
DIMMs
within
the
channels
of
a
branch
must
be
identical
in
size,
type,
speed,
and
technology.
The
following
illustration
shows
how
the
memory
controller
is
organized
into
branches
and
channels
with
two
pairs
of
DIMMs
installed.
DIMM 2
DIMM 3
DIMM 1
DIMM 5
DIMM 6
DIMM 4
DIMM 8
DIMM 7
Memory Controller
Branch 0
Branch 1
Channel 0
Channel 1
Channel 2
Channel 3
Note:
The
DIMMs
in
the
computer
should
be
populated
from
the
largest
DIMM
to
the
smallest
DIMM
(for
example
2
GB,
1
GB,
512
MB).
Populating
DIMMs
from
the
largest
capacity
to
the
smallest
capacity
will
yield
better
performance,
enabling
the
operating
system
to
access
more
of
the
system
memory
before
passing
through
the
advanced
memory
buffer
(AMB)
to
access
the
second
DIMM
on
the
channel.
v
The
computer
can
operate
in
two
major
modes,
mirroring
and
non-mirroring
(normal).
The
computer
can
also
operate
in
a
single-channel
mode
when
one
DIMM
is
installed.
v
The
computer
supports
memory
mirroring
(mirroring
mode)
and
online-spare
memory.
–
Memory
mirroring
replicates
data
in
two
pairs
of
DIMMs
simultaneously,
this
allows
the
computer
to
continue
working
if
one
set
of
DIMMs
fail.
When
you
use
memory
mirroring,
consider
the
following
information:
-
The
memory
is
reduced
to
half
the
amount
of
memory
available.
For
example,
the
maximum
available
memory
is
reduced
from
32
GB
to
16
GB
in
the
mirroring
mode.
-
The
minimum
memory
configuration
is
four
identical
DIMMs.
You
must
install
identical
pairs
of
DIMMs
in
all
four
DIMM
connections
(same
size,
type,
speed,
and
technology).
These
DIMMs
must
span
both
branches
and
all
four
channels.
For
example,
when
you
assign
the
first
four
DIMMs,
you
must
install
two
DIMMs
in
branch
0
(one
in
channel
0
and
one
in
channel
1)
and
two
DIMMs
in
branch
1
(one
in
channel
2
and
one
in
channel
3).
See
the
following
table
for
the
installation
sequence
for
operating
in
the
mirroring
mode.
-
When
you
upgrade
the
computer
to
eight
DIMMs,
the
DIMMs
in
both
branches
must
be
identical
(same
size,
type,
speed,
and
technology).
-
Both
branches
operate
in
dual-channel
mode.
The
following
table
shows
the
DIMM
configuration
upgrade
sequence
(mirroring
mode).
Chapter
4.
Installing
options
49