v
The
server
supports
online-spare
memory.
This
feature
disables
the
failed
memory
from
the
system
configuration
and
activates
an
online-spare
pair
of
DIMMs
to
replace
the
failed
active
DIMM
pair.
See
“Online-spare
memory”
on
page
14
for
more
information
about
online-spare
memory
and
the
DIMM
configuration
that
is
required.
v
You
can
enable
either
online-spare
memory
or
memory
mirroring,
but
not
both
at
the
same
time.
Online-spare
memory
provides
more
memory
capacity
than
mirroring;
mirroring
provides
better
memory
protection
but
less
memory
capacity
than
online-spare
memory.
v
When
you
install
or
remove
DIMMs,
the
server
configuration
information
changes.
When
you
restart
the
server,
the
system
displays
a
message
that
indicates
that
the
memory
configuration
has
changed.
To
install
a
DIMM,
complete
the
following
steps:
1.
Read
the
safety
information
that
begins
on
page
v
and
“Installation
guidelines”
on
page
7.
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.
Attention:
To
avoid
breaking
the
retaining
clips
or
damaging
the
DIMM
connectors,
open,
and
close
the
clips
gently.
12
ThinkServer
RD120
Types
6444,
6445,
6446,
and
6447:
Installation
Guide
Summary of Contents for ThinkServer RD120 Type 6444
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