HP 9000 rp7410 Installation Guide download pdf (Page 16)

Chapter 1

Introduction

Overview

I/O Subsystem

All of the I/O is integrated into the system by way of the PCI-X buses. The CC on each cell board

communicates with one system bus adapter (SBA). The SBA converts the SBA link protocol into “ropes”. A

rope is defined as a high-speed, point-to-point data bus. The SBA can support up to 16 of these high-speed

bi-directional links for a total aggregate bandwidth of approximately 4GB/s. The server supports a maximum

of two SBAs.

There are LBA chips on the PCI-X backplane that act as a bus bridge, supporting either one or two ropes and

capable of driving 33MHz or 66MHz for PCI cards. The LBAs can also drive at 66MHz or 133MHz for PCI-X

cards.

The PCI-X backplane is physically one board but behaves as two independent partitions. SBA 0, its associated

LBAs and eight PCI-X slots form I/O Partition 0. SBA 1, its associated LBAs and eight PCI-X slots form I/O

Partition 1. One I/O partition may be powered down separate from the other I/O partition.

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HP 9000 rp7410 Installation Guide Page 16