Branch 0
Branch 1
Channel 1
Channel 2
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
Installing
additional
DIMMs
in
both
memory
branches
will
improve
system
performance.
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
(for
more
information,
see
the
section
about
configuring
the
server
in
the
User’s
Guide
on
the
IBM
System
x
Documentation
CD).
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;
32
GB
is
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
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
2
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
and
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
mirroring
mode.
Table
2.
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
12
1,
4,
7,
10,
2,
5,
8,
11,
3,
6,
9,
12
12
IBM
System
x3500
Type
7977:
Installation
Guide
Содержание x3500 - System - 7977
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