Lenovo ThinkServer TD100x User Manual
Page 33
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.
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.
For
more
information
on
the
Configuration/Setup
Utility
program,
see
the
User
Guide.
When
you
use
memory
mirroring,
consider
the
following
information:
-
For
TD100
models,
the
maximum
available
memory
is
reduced
to
16
GB,
instead
of
the
32
GB
available
in
non-mirroring
mode.
-
For
TD100x
models,
the
maximum
available
memory
is
reduced
to
24
GB,
instead
of
the
48
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
for
the
DIMM
installation
sequence.
-
When
you
upgrade
the
server
to
eight
or
12
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
12
(TD100x
Machine
Types
4203,
4204,
4205,
4206)
1,
4,
7,
10,
2,
5,
8,
11,
3,
6,
9,
12
Note:
For
TD100
models
(Machine
Types
6398,
6399,
6419,
6429),
DIMM
connectors
3,
6,
9,
and
12
are
not
functional.
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
Chapter
2.
Installing
options
17