IBM x3500 User Guide - Page 48

Devices, Ports, Advanced, Chipset, Control, Memory, Branch, Mirror - memory configuration

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v When you install additional DIMMs, be sure to install them in pairs. All the DIMM pairs must be the same size and type. 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 that are next to each other (for example, in DIMM connector 1 and DIMM connector 4) within the channels of a branch must be identical in size, type, speed, and technology. However, the DIMMs in the connectors above or below each other within the channels of a branch do not have to be identical (for example, the DIMMs in DIMM connector 1 and DIMM connector 2 do not have to be identical). The following illustration shows how the memory controller is organized into branches and channels with two pairs of installed DIMMs. v You do not have to save new configuration information when you install or remove DIMMs. Branch 0 Branch 1 Channel 1 Channel 3 Channel 0 Channel 4 DIMM 6 DIMM 5 DIMM 4 DIMM 3 DIMM 2 DIMM 1 DIMM 12 DIMM 11 DIMM 10 DIMM 9 DIMM 8 DIMM 7 v The 12 DIMM connectors are divided between the two memory branches. DIMM connectors 1 through 6 are on branch 0, and DIMM connectors 7 through 12 are on branch 1. v The server can operate in two major modes: mirroring and non-mirroring (normal). The server can also operate in a single-channel mode when one DIMM is installed. v The server supports memory mirroring (mirroring mode) and online-spare memory. - Memory mirroring replicates and stores data on DIMMs within two branches simultaneously. You must enable memory mirroring through the Configuration/Setup Utility program (see "Using the Configuration/Setup Utility program" on page 50). To enable memory mirroring in the Configuration/Setup Utility program, select Devices and I/O Ports → Advanced Chipset Control → Memory Branch Mode. Use the arrow keys to change the Memory Branch Mode setting to Mirror; then, save your changes. When you use memory mirroring, consider the following information: - The maximum available memory is reduced to 16 GB, instead of the 32 GB available in non-mirroring mode. - The minimum memory configuration is four identical DIMMs. You must install identical pairs of fully buffered, dual-inline memory modules (DIMMs) in all four DIMM connectors (same size, type, speed, and technology). These DIMMs must span across both branches and all four channels. For example, when you install 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 Table 3 on page 35 for the DIMM installation sequence. - When you upgrade the server to eight DIMMs, the DIMMs that are next to each other (for example, DIMM connector 1 and DIMM connector 4) within the channels of a branch must be identical in size, type, speed, and technology. However, the DIMMs in the connectors above or below each 34 IBM System x3500 Type 7977: User's Guide

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v
When
you
install
additional
DIMMs,
be
sure
to
install
them
in
pairs.
All
the
DIMM
pairs
must
be
the
same
size
and
type.
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
that
are
next
to
each
other
(for
example,
in
DIMM
connector
1
and
DIMM
connector
4)
within
the
channels
of
a
branch
must
be
identical
in
size,
type,
speed,
and
technology.
However,
the
DIMMs
in
the
connectors
above
or
below
each
other
within
the
channels
of
a
branch
do
not
have
to
be
identical
(for
example,
the
DIMMs
in
DIMM
connector
1
and
DIMM
connector
2
do
not
have
to
be
identical).
The
following
illustration
shows
how
the
memory
controller
is
organized
into
branches
and
channels
with
two
pairs
of
installed
DIMMs.
v
You
do
not
have
to
save
new
configuration
information
when
you
install
or
remove
DIMMs.
Branch 0
Branch 1
Channel 1
Channel 4
Channel 3
Channel 0
DIMM 6
DIMM 5
DIMM 4
DIMM 12
DIMM 11
DIMM 10
DIMM 3
DIMM 2
DIMM 1
DIMM 9
DIMM 8
DIMM 7
v
The
12
DIMM
connectors
are
divided
between
the
two
memory
branches.
DIMM
connectors
1
through
6
are
on
branch
0,
and
DIMM
connectors
7
through
12
are
on
branch
1.
v
The
server
can
operate
in
two
major
modes:
mirroring
and
non-mirroring
(normal).
The
server
can
also
operate
in
a
single-channel
mode
when
one
DIMM
is
installed.
v
The
server
supports
memory
mirroring
(mirroring
mode)
and
online-spare
memory.
–
Memory
mirroring
replicates
and
stores
data
on
DIMMs
within
two
branches
simultaneously.
You
must
enable
memory
mirroring
through
the
Configuration/Setup
Utility
program
(see
“Using
the
Configuration/Setup
Utility
program”
on
page
50).
To
enable
memory
mirroring
in
the
Configuration/Setup
Utility
program,
select
Devices
and
I/O
Ports
→
Advanced
Chipset
Control
→
Memory
Branch
Mode
.
Use
the
arrow
keys
to
change
the
Memory
Branch
Mode
setting
to
Mirror
;
then,
save
your
changes.
When
you
use
memory
mirroring,
consider
the
following
information:
-
The
maximum
available
memory
is
reduced
to
16
GB,
instead
of
the
32
GB
available
in
non-mirroring
mode.
-
The
minimum
memory
configuration
is
four
identical
DIMMs.
You
must
install
identical
pairs
of
fully
buffered,
dual-inline
memory
modules
(DIMMs)
in
all
four
DIMM
connectors
(same
size,
type,
speed,
and
technology).
These
DIMMs
must
span
across
both
branches
and
all
four
channels.
For
example,
when
you
install
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
Table
3
on
page
35
for
the
DIMM
installation
sequence.
-
When
you
upgrade
the
server
to
eight
DIMMs,
the
DIMMs
that
are
next
to
each
other
(for
example,
DIMM
connector
1
and
DIMM
connector
4)
within
the
channels
of
a
branch
must
be
identical
in
size,
type,
speed,
and
technology.
However,
the
DIMMs
in
the
connectors
above
or
below
each
34
IBM
System
x3500
Type
7977:
User’s
Guide