Document revision date: 19 July 1999

Contents

Preface
Preface	Preface
Chapter 1
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
Chapter 2
2	Configuring Your System for High Data Availability
2.1	Repair and Recovery from Failures
2.2	Shadow Set Configurations
Chapter 3
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
Chapter 4
4	Managing Shadow Sets Using DCL Commands
4.1	Allocating Devices
4.2	Creating a Shadow Set
4.3	Mounting a Shadow Set on Other Nodes in the Cluster
4.4	MOUNT Command Qualifiers for Shadowing
4.5	Adding Shadow Set Members
4.6	Mounting Volume Sets as Shadow Sets
4.7	Dismounting Shadow Sets
4.7.1	Removing Member Units from Shadow Sets
4.7.2	Dismounting and Dissolving Shadow Sets
4.7.3	Dismounting and Remounting With One Less Member
4.8	Displaying Information About Shadow Sets
4.8.1	Listing Shadow Set Virtual Units
4.8.2	Listing Shadow Set Members
4.8.3	Examples of the SHOW DEVICES Command
4.8.4	Using the System Dump Analyzer
4.8.4.1	Obtaining Information About Shadow Sets
4.8.4.2	Obtaining Information About Third-Party SCSI Devices
4.8.5	Using the F$GETDVI Lexical Function
Chapter 5
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
Chapter 6
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	Controlling Assisted Copy and Assisted Minimerge Operations on HSJ Controllers
6.6	What Happens to a Shadow Set When a System Fails?
6.7	Examples of Copy and Merge Operations
Chapter 7
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
Chapter 8
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 Unassisted Merge Operations
8.2.2	Improving Performance for Merge and Copy Operations
8.2.3	Effects on Performance
8.3	Guidelines for Managing Shadow Sets in a System
8.4	Striping (RAID) Implementation
Appendix A
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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