Dimm installation sequence, Memory mirroring, Dimm – Lenovo RD210 User Manual
Page 76: Installation, Sequence, Mirroring
v
The
DIMM
options
that
are
available
for
the
server
are
1
GB,
2
GB,
4
GB,
and
8
GB
(when
available).
The
sever
supports
a
minimum
of
1
GB
and
a
maximum
of
128
GB
of
system
memory.
Note:
The
amount
of
usable
memory
is
reduced
depending
on
the
system
configuration.
A
certain
amount
of
memory
must
be
reserved
for
system
resources.
To
view
the
total
amount
of
installed
memory
and
the
amount
of
configured
memory,
run
the
Setup
utility.
v
A
minimum
of
one
DIMM
must
be
installed
for
each
microprocessor.
For
example,
you
must
install
a
minimum
of
two
DIMMs
if
the
server
has
two
microprocessors
installed.
However,
to
improve
system
performance,
install
a
minimum
of
three
DIMMs
for
each
microprocessor.
v
The
maximum
operating
speed
of
the
server
is
determined
by
the
slowest
DIMM
installed
in
the
server.
DIMM
installation
sequence
v
The
server
comes
with
a
minimum
of
two
1
GB
DIMMs,
installed
in
connectors
3
and
6.
When
you
install
additional
DIMMs,
install
them
in
the
order
shown
in
the
following
table
to
optimize
system
performance.
In
non-mirroring
mode,
all
three
channels
on
the
memory
interface
for
each
microprocessor
can
be
populated
in
any
order
and
have
no
matching
requirements.
Table
7.
Non-mirroring
(normal)
mode
DIMM
installation
sequence
Installed
microprocessors
DIMM
connector
population
sequence
Microprocessor
socket
1
3,
6,
8,
2,
5,
7,
1,
4
Microprocessor
socket
2
11,
14,
16,
10,
13,
15,
9,
12
Memory
mirroring
v
The
server
supports
memory
mirroring
(mirroring
mode):
–
Memory-mirroring
mode
replicates
and
stores
data
on
two
pairs
of
DIMMs
within
two
channels
simultaneously.
If
a
failure
occurs,
the
memory
controller
switches
from
the
primary
pair
of
memory
DIMMs
to
the
backup
pair
of
DIMMs.
To
enable
memory
mirroring
through
the
Setup
utility,
select
System
Settings
→
Memory.
When
you
use
the
memory
mirroring
feature,
consider
the
following
information:
-
When
you
use
memory
mirroring,
you
must
install
a
pair
of
DIMMs
at
a
time.
One
DIMM
must
be
in
channel
0,
and
the
mirroring
DIMM
must
be
in
the
same
slot
in
channel
1.
The
two
DIMMs
in
each
pair
must
be
identical
in
size,
type,
and
rank
(single
or
dual)
,
and
organization,
but
not
in
speed.
The
channels
run
at
the
speed
of
the
slowest
DIMM
in
any
of
the
channels.
-
Channel
2,
DIMM
connectors
8
,7,
15,
and
16
are
not
used
in
memory-mirroring
mode.
-
The
maximum
available
memory
is
reduced
to
half
of
the
installed
memory
when
memory
mirroring
is
enabled.
For
example,
if
you
install
64
GB
of
memory,
only
32
GB
of
addressable
memory
is
available
when
you
use
memory
mirroring.
The
following
diagram
shows
the
memory
channel
interface
layout
with
the
DIMM
installation
sequence
for
mirroring
mode.
The
numbers
within
boxes
indicate
the
DIMM
population
sequence
in
pairs
within
the
channels,
and
the
numbers
next
to
the
boxes
indicate
the
DIMM
connectors
within
the
channels.
For
example,
the
following
illustration
shows
the
first
pair
of
DIMMs
(indicated
by
ones
(1)
inside
the
boxes)
should
be
installed
in
DIMM
connectors
3
on
channel
0
and
DIMM
connector
6
on
channel
1
DIMM
connectors
7,
8,
15,
and
16
on
channel
2
are
60
ThinkServer
RD210
Types
3795,
3796,
3818,
and
3819:
Installation
and
User
Guide