Fujitsu M4000 User Manual download pdf (Page 47)

Chapter 2 System Features and Capabilities 2-3

2.1.2 Memory Subsystem

Each memory board in the server contains four or eight DIMMs (dual inline memory

modules). Both midrange servers use Double Data Rate II (DDR II) type DIMMs. The

memory subsystem supports up to eight-way memory interleaving for high-speed

memory access. For more information on memory boards and DIMMs, see

Section 1.3.3, “Memory Board” on page 1-13.

2.1.3 I/O Subsystem

Each I/O subsystem contains the following:

■ PCI cards—Four short PCIe slots (four upper slots) and one short PCI-X slot

(lowest slot). For additional information see

FIGURE 1-18 and FIGURE 1-19.

■ One I/O controller (IOC) chip, which is the bridge chip between the system bus

and the IO bus

■ PCIe switches or bridges connected to the slots

The PCI slots support the hot-plug function, which enables you to replace the IOU

while the domain is operating. Before you can remove a PCI card, you must first

unconfigure and disconnect it.

You can also add an optional External I/O Expansion Unit, which contains additional

PCIe slots or PCI-X slots.

2.1.4 System Bus

The CPU, memory subsystem, and I/O subsystem are directly connected to implement

data transfer by using a high-speed broadband switch. Individual components are

connected through tightly coupled switches, which use an even latency for data

transfer. These components can be added to the server to enhance the processing

capability (in proportion to the number of components added).

When a data error is detected in a CPU, Memory Access Controller (MAC), or I/O

Controller (IOC), the system bus agent corrects the data and transfers it.

2.1.5 System Control

This section on system control describes XSCFU Hardware, Fault Detection and

Management, and System Remote Control/Monitoring.

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Fujitsu M4000 User Manual Page 47