IBM x3400 Installation Guide - Page 31

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

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For more information on the Configuration/Setup Utility program, see the User's Guide. 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 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 other within the channels of a branch do not have to be identical to each other (for example, the DIMMs in DIMM connector 1 and DIMM connector 2). - Both branches operate in dual-channel mode. The following table shows the DIMM configuration upgrade sequence for operating in mirroring mode. Table 3. DIMM upgrade configuration sequence in mirroring mode Number of DIMMs 4 DIMM connectors 1, 4, 7, 10 8 1, 4, 7, 10, 2, 5, 8, 11 Note: DIMM connectors 3, 6, 9, and 12 are not functional in this server. Do not install DIMMs in these connectors. - Online-spare memory disables a failed rank pair of DIMMs from the system configuration and activates an online-spare rank pair of DIMMs to replace the failed rank pair of DIMMs. For an online-spare pair of DIMMs to be activated, you must enable this feature and have installed an additional rank pair of DIMMs of the same speed, type, size (or larger), and technology as the failed pair of DIMMs. You must enable the feature through the Configuration/Setup Utility program. To enable online-spare memory 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 setting for Branch 0 Rank Sparing or Branch 1 Rank Sparing to Enabled ; then, save your changes. For more information on the Configuration/Setup Utility program, see the User's Guide. When you use online-spare memory, you must consider the following information: - You cannot enable online-spare memory while the server is operating in mirroring mode. - The minimum memory configuration is two single-rank DIMMs installed in branch 0, DIMM connector 1 (in channel 0) and connector 4 (in channel 1); however, online-sparing is not supported with this configuration. - To support online-sparing in branch 0, you must add a second pair of DIMMs. The spare pair of DIMMs can be single-rank or double-rank and must be the same speed, type, size (or larger), and technology as the failed pair of DIMMs. The spare pair must be installed in branch 0, DIMM Chapter 2. Installing options 17

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For
more
information
on
the
Configuration/Setup
Utility
program,
see
the
User’s
Guide
.
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
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
other
within
the
channels
of
a
branch
do
not
have
to
be
identical
to
each
other
(for
example,
the
DIMMs
in
DIMM
connector
1
and
DIMM
connector
2).
-
Both
branches
operate
in
dual-channel
mode.
The
following
table
shows
the
DIMM
configuration
upgrade
sequence
for
operating
in
mirroring
mode.
Table
3.
DIMM
upgrade
configuration
sequence
in
mirroring
mode
Number
of
DIMMs
DIMM
connectors
4
1,
4,
7,
10
8
1,
4,
7,
10,
2,
5,
8,
11
Note:
DIMM
connectors
3,
6,
9,
and
12
are
not
functional
in
this
server.
Do
not
install
DIMMs
in
these
connectors.
–
Online-spare
memory
disables
a
failed
rank
pair
of
DIMMs
from
the
system
configuration
and
activates
an
online-spare
rank
pair
of
DIMMs
to
replace
the
failed
rank
pair
of
DIMMs.
For
an
online-spare
pair
of
DIMMs
to
be
activated,
you
must
enable
this
feature
and
have
installed
an
additional
rank
pair
of
DIMMs
of
the
same
speed,
type,
size
(or
larger),
and
technology
as
the
failed
pair
of
DIMMs.
You
must
enable
the
feature
through
the
Configuration/Setup
Utility
program.
To
enable
online-spare
memory
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
setting
for
Branch
0
Rank
Sparing
or
Branch
1
Rank
Sparing
to
Enabled
;
then,
save
your
changes.
For
more
information
on
the
Configuration/Setup
Utility
program,
see
the
User’s
Guide
.
When
you
use
online-spare
memory,
you
must
consider
the
following
information:
-
You
cannot
enable
online-spare
memory
while
the
server
is
operating
in
mirroring
mode.
-
The
minimum
memory
configuration
is
two
single-rank
DIMMs
installed
in
branch
0,
DIMM
connector
1
(in
channel
0)
and
connector
4
(in
channel
1);
however,
online-sparing
is
not
supported
with
this
configuration.
-
To
support
online-sparing
in
branch
0,
you
must
add
a
second
pair
of
DIMMs.
The
spare
pair
of
DIMMs
can
be
single-rank
or
double-rank
and
must
be
the
same
speed,
type,
size
(or
larger),
and
technology
as
the
failed
pair
of
DIMMs.
The
spare
pair
must
be
installed
in
branch
0,
DIMM
Chapter
2.
Installing
options
17