Volume Shadowing for OpenVMS

Contents (summary)

• Chapter 1 Introduction to Volume Shadowing for OpenVMS
• Chapter 2 Configuring Your System for High Data Availability
• Chapter 3 Preparing to Use Volume Shadowing
• Chapter 4 Managing Shadow Sets Using DCL Commands
• Chapter 5 Managing Shadow Sets with System Services
• Chapter 6 Ensuring Shadow Set Consistency
• Chapter 7 Performing System Management Tasks on Shadowed Systems
• Chapter 8 Performance Information for Volume Shadowing
• Appendix A Migrating from Phase I to Phase II Shadowing
• Appendix B Messages
• Index
• Figures
• Examples
• Tables

Contents

• ---

  Chapter 1 Introduction to Volume Shadowing for OpenVMS
  • 1.1 Overview
  • 1.2 Hardware Environment
    • 1.2.1 Supported Devices
    • 1.2.2 Unsupported Devices
  • 1.3 Supported Configurations
  • 1.4 Shadowing Disks Across an OpenVMS Cluster System
  • 1.5 Installation

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  Chapter 2 Configuring Your System for High Data Availability
  • 2.1 Repair and Recovery from Failures
  • 2.2 Shadow Set Configurations

• ---

  Chapter 3 Preparing to Use Volume Shadowing
  • 3.1 Licensing Volume Shadowing for OpenVMS
  • 3.2 Setting the Volume Shadowing Parameters
    • 3.2.1 Example of Shadowing Values for MODPARAMS.DAT
    • 3.2.2 Displaying System Parameters
  • 3.3 Booting from a System Disk Shadow Set
  • 3.4 Booting Satellite Nodes from an MSCP Served System Disk Shadow Set

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  Chapter 4 Managing Shadow Sets Using DCL Commands
  • 4.1 Allocating Devices
  • 4.2 Creating a Shadow Set
  • 4.3 MOUNT Command Qualifiers for Shadowing
  • 4.4 Adding Shadow Set Members
  • 4.5 Mounting Volume Sets as Shadow Sets
  • 4.6 Dismounting Shadow Sets
    • 4.6.1 Removing Member Units from Shadow Sets
    • 4.6.2 Dismounting and Dissolving Shadow Sets
  • 4.7 Displaying Information About Shadow Sets
    • 4.7.1 Listing Shadow Set Virtual Units
    • 4.7.2 Listing Shadow Set Members
    • 4.7.3 Examples of the SHOW DEVICES Command
    • 4.7.4 Using the System Dump Analyzer
      • 4.7.4.1 Obtaining Information About Shadow Sets
      • 4.7.4.2 Obtaining Information About Third-Party SCSI Devices
    • 4.7.5 Using the F$GETDVI Lexical Function

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  Chapter 5 Managing Shadow Sets with System Services
  • 5.1 Using $MOUNT to Create and Mount Shadow Sets
  • 5.2 $MOUNT Shadow Set Item Codes
  • 5.3 Using $MOUNT to Mount Volume Sets
  • 5.4 Using $DISMOU to Dismount Shadow Sets
    • 5.4.1 Removing Member Units from Shadow Sets
    • 5.4.2 Dismounting and Dissolving Shadow Sets
    • 5.4.3 Setting $DISMOU Flags for Shadow Set Operations
  • 5.5 Evaluating Condition Values Returned by $DISMOU and $MOUNT
  • 5.6 Using $GETDVI to Obtain Information About Shadow Sets
    • 5.6.1 $GETDVI Shadow Set Item Codes
    • 5.6.2 Obtaining the Device Names of Shadow Set Members
      • 5.6.2.1 Virtual Unit Names
      • 5.6.2.2 Member Unit Names

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  Chapter 6 Ensuring Shadow Set Consistency
  • 6.1 Shadow Set Consistency
  • 6.2 Copy Operations
    • 6.2.1 Unassisted Copy Operations
    • 6.2.2 Assisted Copy Operations
  • 6.3 Merge Operations
    • 6.3.1 Unassisted Merge Operations
    • 6.3.2 Assisted Merge Operations
  • 6.4 Controlling Assisted Copy and Assisted Minimerge Operations on HSC Controllers
  • 6.5 What Happens to a Shadow Set When a System Fails?
  • 6.6 Examples of Copy and Merge Operations

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  Chapter 7 Performing System Management Tasks on Shadowed Systems
  • 7.1 Upgrading the OpenVMS Operating System on a System Disk Shadow Set
  • 7.2 Modifying Data on Individual Shadow Set Members
  • 7.3 Performing Backup Operations on a Shadow Set
    • 7.3.1 Restrictions on BACKUP Procedures
    • 7.3.2 Using Copy Operations to Create a Backup
    • 7.3.3 Using the OpenVMS Backup Utility
    • 7.3.4 Using BACKUP/IMAGE on a Shadow Set
  • 7.4 Crash Dumping to a Shadowed Disk

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  Chapter 8 Performance Information for Volume Shadowing
  • 8.1 Performance During Steady State
  • 8.2 Performance During Copy and Merge Operations
    • 8.2.1 Improving Performance for Merge and Copy Operations
    • 8.2.2 Effects on Performance
  • 8.3 Guidelines for Managing Shadow Sets in a System
  • 8.4 Striping (RAID) Implementation

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  Appendix A Migrating from Phase I to Phase II Shadowing
  • A.1 Overview of Phase II Shadowing
  • A.2 How to Migrate Shadow Sets from Phase I to Phase II
    • A.2.1 Migrating Nonsystem Disk Shadow Sets
    • A.2.2 Migrating System Disk Shadow Sets
    • A.2.3 Adjusting Parameters and Bootstrap Values
    • A.2.4 Sample User Session
  • A.3 Comparison of Phase I and Phase II Shadowing
    • A.3.1 Interdependencies Between Operating System Versions and Volume Shadowing Phases

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  Appendix B Messages
  • B.1 Mount Verification Messages
  • B.2 OPCOM Message
  • B.3 Shadow Server Messages
  • B.4 VOLPROC Messages

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  Index

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  Examples
  • 3-1 Nodes Not Registered to Use Volume Shadowing
  • 3-2 MODPARAMS.DAT File
  • 3-3 LANCP Database Example of a Satellite Node
  • 3-4 DECnet Database Example of a Satellite Node
  • 4-1 Creating a Shadow Set
  • 4-2 Using the /NOASSIST Qualifier
  • 4-3 Using the /CLUSTER Qualifier
  • 4-4 Adding Disk to an Existing Shadow Set
  • 4-5 Mounting a Shadowed Volume Set
  • 4-6 Dissolving a Shadow Set
  • 5-1 Item List to Create and Mount a Shadow Set
  • 5-2 Item List for Adding a Member to a Shadow Set
  • 5-3 Item List for Creating and Mounting a Volume Set
  • 5-4 Removing a Member from a Shadow Set
  • 5-5 Dismounting and Dissolving a Shadow Set Locally
  • 5-6 Dismounting and Dissolving a Shadow Set Across the Cluster
  • 6-1 Copy Operation: Creating a New Shadow Set
  • 6-2 Copy Operation: Adding a Member to an Existing Shadow Set
  • 6-3 No Copy Operation: Rebuilding a Shadow Set
  • 6-4 Merge Operation: Rebuilding a Shadow Set
  • A-1 Migrating a Phase I Shadow Set to Phase II

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  Figures
  • 1-1 Elements of a Shadow Set
  • 1-2 Shadow Sets Accessed Through the MSCP Server
  • 2-1 Levels of Availability
  • 2-2 Configuration of a Shadow Set (One CPU, One Controller)
  • 2-3 Configuration of a Shadow Set (One CPU, Two Controllers)
  • 2-4 Configuration of a Shadow Set (An OpenVMS Cluster, Dual Controllers)
  • 2-5 Configuration of a Shadow Set (Highly Available Local Area OpenVMS Cluster)
  • 2-6 Configuration of a Shadow Set (With Multiple Star Couplers and Multiple Controllers)
  • 2-7 Configuration of a Shadowed FDDI Cluster
  • 3-1 Booting Satellite Nodes
  • 6-1 Steady State Transitions
  • 6-2 Copy Operation Transitions
  • 6-3 Minimerge Operation Transitions
  • 6-4 Merge Operation Transitions

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  Tables
  • 2-1 Types of Device Failures
  • 3-1 Volume Shadowing Parameters
  • 3-2 SHADOWING Parameter Settings
  • 4-1 MOUNT Command Qualifiers
  • 4-2 F$GETDVI Items for Volume Shadowing
  • 5-1 SYS$MOUNT Item Codes
  • 5-2 $DISMOU Flag Options
  • 5-3 SYS$GETDVI Item Codes
  • 6-1 Information in the Storage Control Block (SCB)
  • 8-1 Copy Times (In Minutes) for Two-Member RA82 Shadow Sets
  • 8-2 RAID Levels

  5423PTOC.HTM
  OSSG Documentation
  22-NOV-1996 13:03:53.66

Copyright © Digital Equipment Corporation 1996. All Rights Reserved.

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