Memory mirroring, Memory, Mirroring – Lenovo RD120 User Manual
Page 76
To
install
a
DIMM,
complete
the
following
steps.
1.
Read
the
safety
information
that
begins
on
page
and
2.
Turn
off
the
server
and
peripheral
devices,
and
disconnect
the
power
cord
and
all
external
cables.
Attention:
In
a
dc
power
environment,
only
trained
service
personnel
other
than
Lenovo
service
technicians
are
authorized
to
connect
or
disconnect
power
to
the
dc
power
supply.
See
the
documentation
that
comes
with
each
dc
power
supply.
3.
Remove
the
cover
(see
Attention:
To
avoid
breaking
the
retaining
clips
or
damaging
the
DIMM
connectors,
open
and
close
the
clips
gently.
4.
Remove
the
riser-card
assembly
(see
5.
Remove
the
DIMM
air
baffle
(see
6.
Open
the
retaining
clip
on
each
end
of
the
DIMM
connector.
7.
Touch
the
static-protective
package
that
contains
the
DIMM
to
any
unpainted
metal
surface
on
the
server.
Then,
remove
the
DIMM
from
the
package.
8.
Turn
the
DIMM
so
that
the
DIMM
keys
align
correctly
with
the
connector.
9.
Insert
the
DIMM
into
the
connector
by
aligning
the
edges
of
the
DIMM
with
the
slots
at
the
ends
of
the
DIMM
connector.
Firmly
press
the
DIMM
straight
down
into
the
connector
by
applying
pressure
on
both
ends
of
the
DIMM
simultaneously.
The
retaining
clips
snap
into
the
locked
position
when
the
DIMM
is
firmly
seated
in
the
connector.
Important:
If
there
is
a
gap
between
the
DIMM
and
the
retaining
clips,
the
DIMM
has
not
been
correctly
inserted;
open
the
retaining
clips,
remove
the
DIMM,
and
then
reinsert
it.
If
you
have
other
optional
devices
to
install
or
remove,
do
so
now.
Otherwise,
go
to
Memory
mirroring
You
can
configure
the
server
to
use
memory
mirroring.
Memory
mirroring
stores
data
in
two
pairs
of
DIMMs
simultaneously.
If
a
failure
occurs,
the
memory
controller
switches
from
the
active
pair
to
the
mirroring
pair.
Memory
mirroring
reduces
the
amount
of
available
memory.
Enable
memory
mirroring
through
the
Configuration/Setup
Utility
program.
See
for
details
about
enabling
memory
mirroring.
62
ThinkServer
RD120
Types
6444,
6445,
6446,
and
6447:
User
Guide