Lenovo ThinkServer RD120 User Guide - Page 20

Diagnostics, Memory, mirroring, Online-spare, memory, Express, adapter, capabilities, Redundant,

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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

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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