45xx Modular Disk Subsystem Manual for G-Series Releases

Table Of Contents

Introduction

45xx Modular Disk Subsystem Manual for G-Series Releases—142466

1-12

Interface Components

The 45xx modular disk subsystem uses the following components to communicate with

a Tandem host system:

•

6760 ServerNet device adapter (containing one or more SACs)

•

Fiber-optic cables

6760 ServerNet Device Adapter

The 6760 ServerNet device adapter manages input/output (I/O) operations for the 45xx

modular disk subsystem on Himalaya S-series servers. The 6760 adapter consists of two

parts: a logic board and up to four ServerNet addressable controllers (SACs). For

detailed information about the 6760 adapter and its SACs, see the 6760 ServerNet/DA

Manual.

The 6760 adapter allows a fiber-optic link up to 2 kilometers (1.2 miles) long to be made

between a Tandem host system and a 45xx modular disk subsystem. You can attach up

to eight disk drives in one 45xx disk module to one SAC on each 6760 adapter. For

maximum fault tolerance and performance, you can connect two 6760 adapters to a

45xx disk module. See Figure 1-7

which shows how two 6760 adapters can be

connected to BEBs in a 45xx disk module.

For more information about fault-tolerant configurations for the 45xx modular disk

subsystem, see Fault Tolerance

on page 1-13.

Figure 1-7. 6760 Adapters, SACs, Fiber-Optic Cables, BEBs, and Disk Module

003CDT .CDD

Fiber-Optic Cable

45xx Disk Module

BEB

SAC

6760 Adapter