Chapter 1 System Overview 1-5
As faster and higher-performing CPU modules become available, they can be
added to or replace existing installed CPU modules to further improve
performance.
The system uses symmetric multiple-processing (SMP), so each CPU can access
any part of system memory regardless of its mounting location. Adding more
CPUs does not affect memory access to any of the installed CPUs.
■ High-speed crossbar-type system bus
The high-speed crossbar-type system bus provides high-speed wide-band data
transfer.
■ ECC memory
ECC functionality protects data on all system buses and in memory, so that any
errors in data are automatically corrected. In addition to ECC memory, Chipkill
memory protection is supported.
■ PCIe is mounted as I/O buses
PCIe, with a maximum bus width of eight lanes is used for the inter-connect bus
with the I/O device.
■ An optional External I/O Expansion Unit enables I/O slot expansion in the
system
Connect an External I/O Expansion Unit to add more PCIe and PCI-X slots to the
server.
An External I/O Expansion Unit is connected by a cable to a link card plugged
into a PCIe slot in an I/O unit.
■ The main components, power supply units, and FAN units can be configured to
be redundant
Redundant configurations can be used for the main components, such as a power
supply unit, FAN unit, hard disk unit, and PCI card. Implementation of
redundant configurations enables operation to continue without interruption
even if one of the units making up part of the system fails.
■ The main components, power supply units, and FAN units support active
replacement/addition
Component replacement and addition during system operation supported for the
main components, such as a power supply unit, FAN unit, hard disk unit, System
Control Facility (board), system board, and PCI card, with some exceptions.
Dynamic reconfiguration (DR) is used for active replacement and addition of
CMU and IOU configuring the system board.
PCI hot-plug (PHP) function enables replacement and addition of PCI Cards
while the system is running.
■ Automatic reboot on failure
