HP Volume Shadowing for OpenVMS

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Preface Intended Audience Document Structure Related Documents Reader's Comments How to Order Additional Documentation Conventions

Introduction to Volume Shadowing for OpenVMS Overview Volume Shadowing Tasks and Operations Hardware Environment Supported Configurations Dynamic Volume Expansion Shadowing Disks Across an OpenVMS Cluster System Installation

Configuring Your System for High Data Availability Levels of High Data Availability Using Volume Shadowing Repair and Recovery from Failures Shadow Set Configurations

Preparing to Use Volume Shadowing Configuration Tasks Licensing Volume Shadowing for OpenVMS Volume Shadowing Parameters Write Bitmap System Parameters Booting from a System Disk Shadow Set Booting Satellite Nodes from an MSCP Served System Disk Shadow Set

Creating and Managing Shadow Sets Using DCL Commands Allocating Devices Creating a Shadow Set Using INITIALIZE/SHADOW/ERASE to Streamline the Formation of a Shadow Set MOUNT Command Qualifiers for Shadowing Adding Shadow Set Members Mounting a Shadow Set on Other Nodes in the Cluster Specifying Disaster-Tolerant Management Attributes (Alpha Only) Managing Copy and Merge Operations (Alpha Only) Removing Members and Dissolving Shadow Sets Displaying Information About Shadow Sets

Creating and Managing Shadow Sets with System Services Using $MOUNT to Create and Mount Shadow Sets $MOUNT Shadow Set Item Codes Using $MOUNT to Mount Volume Sets Using $DISMOU to Dismount Shadow Sets Evaluating Condition Values Returned by $DISMOU and $MOUNT Using $GETDVI to Obtain Information About Shadow Sets

Ensuring Shadow Set Consistency Shadow Set Consistency Copy Operations Merge Operations Controlling HSC Assisted Copy and Minimerge Operations What Happens to a Shadow Set When a System Fails? Examples of Copy and Merge Operations

Using Minicopy for Backing Up Data (Alpha) What Is Minicopy? Different Uses for Copy and Minicopy Why Use Minicopy? Procedure for Using Minicopy Minicopy Restrictions Creating Write Bitmaps Starting a Minicopy Operation Master and Local Write Bitmaps System Parameters for Managing Write Bitmap Messages and Shadow Set Limit Managing Write Bitmaps With DCL Commands Performance Implications of Write Bitmaps Guidelines for Using a Shadow Set Member for Backup

Performing System Management Tasks on Shadowed Systems Upgrading the Operating System on a System Disk Shadow Set Modifying Data on Individual Shadow Set Members Performing Backup Operations on a Shadow Set Crash Dumping to a Shadowed Disk

Performance Information for Volume Shadowing Factors That Affect Performance of a Shadow Set Performance During Steady State Performance During Copy and Merge Operations Guidelines for Managing Shadow Set Performance Striping (RAID) Implementation

Messages Mount Verification Messages OPCOM Message Shadow Server Messages VOLPROC Messages

Glossary

Index