CONTENTS

  Title Page

  Copyright Page

  Preface

  1      Overview of VAX Fault-Tolerant Computing

  1.1     What Is Fault-Tolerant Computing?
    1.1.1      Fault Tolerance and Conventional Computing
    1.1.2      When to Use Fault-Tolerant Systems

  1.2     Digital's Approach to Fault Tolerance

  1.3     System Architecture
    1.3.1      System Hardware
      1.3.1.1      Processor Modules
      1.3.1.2      Memory
      1.3.1.3      Crosslink
    1.3.2      Communications

  1.4     System Software
    1.4.1      VMS Operating System
    1.4.2      VMS Volume Shadowing
    1.4.3      VAXft System Services

  1.5     System Management Utilities

  1.6     Power Subsystem

  1.7     Cooling Monitor

  1.8     Summary of System Characteristics

  2      System Configurations and Options

  2.1     Entry System
    2.1.1      Entry System Mass Storage
    2.1.2      Entry System Module Configuration

  2.2     Expanded System
    2.2.1      Expanded System Mass Storage
    2.2.2      Expanded System Module Configuration

  2.3     System Console

  2.4     Guidelines for Shadowing Data

  2.5     Summary of System Configuration Characteristics

  3      Networking Communications

  3.1     Ethernet Connections

  3.2     DECserver Terminal Servers

  3.3     Synchronous Communications

  3.4     Summary of System Communication Characteristics

  4      System Service and Warranty

  4.1     Service and Repair Features

  4.2     System Warranty
    4.2.1      Standard Warranty
    4.2.2      List Warranty

  4.3     Digital Assisted Services Program

  4.4     Summary of System Service and Repair Features

  Glossary
    automatic dialout notification . . . failover
    Failover Set Manager (FSM) . . . secondary I/O module
    shadow set . . . zone

  FIGURES

  1-1        VAXft 3000 System Diagram

  1-2        Software Features of the VAX Fault-Tolerant System

  1-3        Most Common Causes of System Failure Due to Environmental Conditions

  2-1        Photo of VAXft 3000 Entry System

  2-2        Entry System Configuration

  2-3        Entry System Disk Configuration

  2-4        Photo of Expanded System

  2-5        Expanded System Configuration

  2-6        Expanded System Disk Configuration

  2-7        System Console

  3-1        System Configured to Single Ethernet

  3-2        System Configured to Dual Ethernet

  3-3        Synchronous Communication Lines Using Y-Connectors

  4-1        Photo Showing Access to Entry System Components

  4-2        Photo Showing Access to Expanded System Components

  TABLES

  2-1        Module Options for the Entry System

  2-2        Options Table for Expanded System