Lenovo RD120 User Manual
Page 20
v
Easy
LED
Diagnostics
Easy
LED
Diagnostics
provides
LEDs
to
help
you
diagnose
problems.
For
more
information,
see
the
section
about
Easy
LED
Diagnostics
in
the
Hardware
Maintenance
Manual.
v
Memory
mirroring
Memory
mirroring
improves
the
reliability
of
memory
by
writing
information
to
the
main
memory
and
redundant
locations
in
a
mirrored
pair
of
DIMMs.
v
Online-spare
memory
Online-spare
memory
disables
a
failed
pair
of
DIMMs
from
the
system
configuration
and
activates
an
online-spare
DIMM
pair
to
replace
the
failed
pair.
v
PCI
Express
adapter
capabilities
The
server
has
two
slots
for
low-profile
PCI
Express
x4
adapters.
These
slots
accept
x8
adapters,
but
the
adapters
will
operate
as
x4
adapters.
The
server
also
has
two
slots
for
PCI
Express
x8
adapters
(on
the
riser
card,
full-height,
one
full-length
and
one
half-length).
Note:
You
can
replace
these
PCI
Express
x8
slots
with
PCI-X
133
MHz
slots
by
replacing
the
PCI
Express
riser-card
assembly
with
an
optional
PCI-X
riser-card
assembly.
v
Redundant
connection
The
addition
of
an
optional
network
interface
card
(NIC)
provides
a
failover
capability
to
a
redundant
Ethernet
connection.
If
a
problem
occurs
with
the
primary
Ethernet
connection,
all
Ethernet
traffic
that
is
associated
with
the
primary
connection
is
automatically
switched
to
the
redundant
NIC.
If
the
applicable
device
drivers
are
installed,
this
switching
occurs
without
data
loss
and
without
user
intervention.
v
Redundant
cooling
and
power
capabilities
The
server
supports
up
to
10
hot-swap
fans,
in
multiples
of
5,
which
provide
redundant
cooling.
Redundant
cooling
enables
continued
operation
if
one
of
the
fans
fails.
The
server
supports
up
to
two
835-watt
ac
power
supplies,
which
provide
redundancy
and
hot-swap
capability
for
a
typical
configuration.
If
the
maximum
load
on
the
server
is
less
than
835
watts
and
a
problem
occurs
with
one
of
the
power
supplies,
the
other
power
supply
can
meet
the
power
requirements.
Note:
A
700-watt-48
volt
dc
power
supply
option
may
be
available.
The
dc
power
supplies
provide
redundancy
but
no
hot-swap
capability.
v
RAID
support
The
server
supports
an
internal
ServeRAID-8k
or
8k-l
SAS
Controller,
which
is
required
for
you
to
use
the
hot-swap
hard
disk
drives
and
to
create
redundant
array
of
independent
disks
(RAID)
configurations.
6
ThinkServer
RD120
Types
6444,
6445,
6446,
and
6447:
User
Guide