Chapter
1.
Introduction
This
chapter
gives
an
overview
of
the
features
of
the
IBM
®
BladeCenter
®
QS21
and
what
options
are
available.
The
BladeCenter
QS21
The
high
performance
BladeCenter
QS21
is
based
on
the
64-bit
Cell
Broadband
Engine
™
(Cell/B.E.)
processor
with
a
frequency
of
3.2
GHz.
Two
processors
are
supported
per
blade
and
are
directly
mounted
on
the
blade
planar
board
to
provide
multiprocessing
capability.
Each
processor
includes
32/32
KB
L1
(data/instruction)
and
512
KB
L2
cache.
The
Cell/B.E.
implementation
of
the
broadband
processor
architecture
includes
one
PowerPC
®
Processor
Element
(PPE)
element
and
eight
synergistic
processing
elements
(SPE).
Each
SPE
includes
one
synergistic
processing
unit
(SPU)
with
its
own
local
store
(LS),
and
one
dedicated
memory
flow
controller
(MFC),
which
has
an
associated
memory
management
unit
(MMU)
to
hold
and
process
memory
protection
and
access
permission
information.
To
facilitate
data
flow
on-chip
and
externally,
the
Cell/B.E.
also
implements
the
broadband
engine
bus
and
other
I/O
structures.
The
memory
subsystem
on
BladeCenter
QS21
consists
of
18
XDR
memory
modules
per
Cell/B.E.
chip,
creating
1
GB
of
error
checking
and
correction
(ECC)
memory
per
Cell/B.E.
chip.
The
system
board
therefore
has
a
total
of
2
GB
system
memory.
There
is
a
high
speed
RAMBUS
interface
to
the
processor,
a
PCI-X
connector
for
BladeCenter
I/O
extension
cards,
a
4x
PCI-Express
channel
providing
high
speed
I/O,
a
1
Gigabit
Ethernet
NIC,
a
UART
and
an
external
bus
controller.
Attached
to
the
external
bus
are
a
Flash
EPROM
device
(8
Mbyte),
1
MB
of
battery-backed
NVRAM
and
battery-backed
real-time
clock
(RTC).
The
local
service
processor
supports
environmental
monitoring,
front
panel,
chip
initialization
and
the
BladeCenter
unit
Advanced
Management
Module
interface.
To
ensure
compatibility
with
existing
blades,
the
BladeCenter
QS21
provides
two
midplane
connectors.
These
connectors
contain
Gigabit
Ethernet
links,
USB
ports
(for
support
of
BladeCenter
unit
media
tray
devices),
power
and
a
unit
management
bus.
The
blade
includes
support
for
an
optional
InfiniBand
expansion
card
and
an
optional
Serial
Attached
SCSI
(SAS)
card.
For
more
information
about
the
processor
itself,
see
http://www.ibm.com/
developerworks/power/cell.
Features
and
specifications
The
BladeCenter
QS21
is
a
high-density,
high-performance
multiprocessor
server
system.
It
is
based
on
the
Cell
Broadband
Engine
processor
(Cell/B.E.)
and
provides
leading
edge
performance
density
with
its
single
wide
2-way
blade
server.
©
Copyright
IBM
Corp.
2006,
2008
1
Summary of Contents for QS21 - BladeCenter - 0792
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