v
Large
system
memory
Depending
on
the
blade
server
model,
it
supports
up
to
16
GB
(single-width
models)
or
32
GB
(double-width
models)
of
system
memory.
The
memory
controller
in
each
microprocessor
provides
support
for
up
to
four
industry-standard
VLP,
DDR2,
ECC
SDRAM
registered
x4
(Chipkill)
or
x8
(non-Chipkill)
DIMMs.
For
the
most
current
list
of
supported
DIMMs,
see
the
ServerProven
®
list
at
http://www.ibm.com/servers/eserver/serverproven/compat/
us/.
v
Light
path
diagnostics
Light
path
diagnostics
provides
light-emitting
diodes
(LEDs)
to
help
you
diagnose
problems.
For
more
information,
see
the
Problem
Determination
and
Service
Guide
.
v
PCI
Express
PCI
Express
is
a
fully-serial
interface
that
can
be
used
for
universal
connectivity
for
use
as
a
chip-to-chip
interconnect,
I/O
interconnect
for
adapters,
and
an
I/O
attachment
point
to
Gigabit-networking
devices.
Using
an
expansion
unit,
you
can
add
additional
LAN
interfaces.
v
Power
throttling
Each
blade
server
is
powered
by
two
BladeCenter
redundant
power-supply
modules.
By
enforcing
a
power
policy
known
as
power
domain
oversubscription,
the
BladeCenter
unit
can
share
the
power
load
between
two
power
modules
to
ensure
efficient
power
for
each
device
in
the
BladeCenter
unit.
This
policy
is
enforced
when
the
initial
power
is
applied
to
the
BladeCenter
unit
or
when
a
blade
server
is
inserted
into
the
BladeCenter
unit.
You
can
configure
and
monitor
the
power
environment
by
using
the
management
module.
For
more
information
about
configuring
and
using
power
throttling,
see
the
management-module
documentation
or
http://www.ibm.com/bladecenter/
and
click
Support
.
Reliability,
availability,
and
serviceability
features
Three
of
the
most
important
features
in
server
design
are
reliability,
availability,
and
serviceability
(RAS).
These
RAS
features
help
to
ensure
the
integrity
of
the
data
that
is
stored
in
the
blade
server,
the
availability
of
the
blade
server
when
you
need
it,
and
the
ease
with
which
you
can
diagnose
and
correct
problems.
The
blade
server
has
the
following
RAS
features:
v
Advanced
Configuration
and
Power
Interface
(ACPI)
v
Automatic
error
retry
or
recovery
v
Automatic
server
restart
v
Built-in
monitoring
for
temperature,
voltage,
and
hard
disk
drives
v
Chipkill
™
memory
for
x4
DIMMs
v
Customer
support
center
24
hours
per
day,
7
days
a
week
1
v
Customer-upgradeable
basic
input/output
system
(BIOS)
code
and
diagnostics
v
Diagnostic
support
of
Ethernet
controllers
v
ECC
memory
v
ECC
protection
on
the
L2
cache
v
Error
codes
and
messages
v
Failover
Ethernet
support
v
Hot-swap
drives
on
optional
SAS
storage
expansion
unit
v
Light
path
diagnostics
feature
v
Microprocessor
built-in
self-test
(BIST)
during
power-on
self-test
(POST)
v
Microprocessor
presence
detection
1.
Service
availability
will
vary
by
country.
Response
time
will
vary
depending
on
the
number
and
nature
of
incoming
calls.
Chapter
1.
Introduction
9
Summary of Contents for LS21 - BladeCenter - 7971
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