HP Volume Shadowing for OpenVMS: OpenVMS Version 8.4
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HP Part Number: BA554-90020
Published: June 2010
© Copyright 2010 Hewlett-Packard Development Company, L.P.
Table of Contents
- Preface
- 1 Introduction to HP Volume Shadowing for OpenVMS
- Overview
- Volume Shadowing Tasks and Operations
- Hardware Environment
- Supported Configurations
- Maximum Number of Shadow Sets
- Support for Six-Member Shadow Sets
- Shadowing System Disks
- Using Minicopy in a Mixed-Version OpenVMS Cluster System
- Shadow Sets, Bound Volume Sets, and Stripe Sets
- Shadowing Disks Across an OpenVMS Cluster System
- HBMM Configuration Requirements
- HBMM Restrictions
- HBMM in a Mixed-Version or Mixed-Architecture OpenVMS Cluster System
- Installation
- 2 Configuring Your System for High Data Availability
- 3 Preparing to Use Volume Shadowing
- 4 Creating and Managing Shadow Sets Using DCL Commands
- Allocating Devices
- Creating a Shadow Set
- Using INITIALIZE/SHADOW/ERASE to Form a Shadow Set (Integrity servers and Alpha)
- MOUNT Command Qualifiers for Shadowing
- Adding Shadow Set Members
- Mounting a Shadow Set on Other Nodes in the Cluster
- Managing Shadow Sets With SET SHADOW (Integrity servers and Alpha)
- Managing Copy and Merge Operations (Integrity servers and Alpha)
- Prioritizing Merge and Copy Operations
- Default Management of Merge and Copy Operations
- Hierarchy of Transient State Operations
- Assigning Priorities to Shadow Sets
- Displaying Shadow Set Priority Values
- Controlling Which Systems Manage Merge and Copy Operations
- Managing Merge Operations
- Managing Copy Operations
- Managing Transient States in Progress
- Removing Members and Dissolving Shadow Sets
- Displaying Information About Shadow Sets
- 5 Creating and Managing Shadow Sets with System Services
- 6 Ensuring Shadow Set Consistency
- 7 Using Minicopy for Backing Up Data (Integrity servers and Alpha)
- What Is Minicopy?
- Different Uses for Copy and Minicopy
- Why Use Minicopy?
- Procedure for Using Minicopy
- Minicopy Restrictions
- Write Bitmaps and Dissimilar Device Shadowing Caution
- Creating Bitmaps
- Starting a Minicopy Operation
- Master and Local Bitmaps
- Managing Bitmaps With DCL Commands
- Performance Implications of Bitmaps
- Guidelines for Using a Shadow Set Member for Backup
- 8 Host-Based Minimerge (HBMM)
- Overview of Full Merge and Minimerge Operations
- Overview of HBMM
- HBMM Policy Specification Syntax
- Rules Governing HBMM Policies
- Guidelines for Establishing HBMM Policies
- Configuring and Managing HBMM
- How to Define an HBMM Policy
- How to Assign an HBMM Policy to a Shadow Set
- How to Activate HBMM on a Shadow Set
- How to Disable HBMM on a Shadow Set
- How to Remove a Policy Assignment from a Shadow Set
- How to Change a Policy Assignment of a Shadow Set
- How to Delete a Named Policy from the Cluster
- How to Apply a Changed DEFAULT Policy
- How to Display Policies
- How to Display the Merge Status of Shadow Sets
- How to Prevent Merge Operations on a System
- Considerations for Multiple-Site OpenVMS Cluster Systems
- Use of /DEMAND_MERGE When HBMM Is Enabled
- Visible Impact of Transient State Events
- Automatic Minicopy on Volume Processing
- Multiuse Property for Host-Based Minicopies
- Examples of Multiuse and Dismount
- 9 Performing System Management Tasks on Shadowed Systems
- 10 Performance Information for Volume Shadowing
- A Messages
- Glossary
- Index
List of Figures
- 1-1 Virtual Unit
- 1-2 Elements of a Shadow Set
- 1-3 Shadow Sets Accessed Through the MSCP Server
- 2-1 Levels of Availability
- 2-2 OpenVMS Cluster System With Two FC Switches, Two Dual Controllers and Two Shadow Sets
- 2-3 OpenVMS Cluster System With Four Systems, Four FC Switches, Four Dual Controllers, and Two Shadow Sets
- 2-4 Multiple-Site OpenVMS Cluster System With Four Systems, Four FC Switches, Four Controllers, and Two Shadow Sets
- 3-1 Booting Satellite Nodes
- 4-1 Multiple-Site OpenVMS Cluster System With FC and LAN Interconnects
- 7-1 Application Writes to a Shadow Set
- 7-2 Application Writes to a Bitmap
- 7-3 Member Returned to the Shadow Set (Virtual Unit)
List of Tables
- 1-1 Main Volume Shadowing Tasks, Operation Name, and Related Software
- 2-1 Types of Failures
- 3-1 Volume Shadowing Parameters
- 3-2 SHADOWING Parameter Settings
- 3-3 System Parameter Settings for Multipath Shadow Sets
- 3-4 Bitmap System Parameters
- 4-1 MOUNT Command Qualifiers (Shadowing Specific)
- 4-2 Additional MOUNT Command Qualifiers (Not Shadowing Specific)
- 4-3 SET SHADOW Command Qualifiers
- 4-4 ANALYZE/DISK/SHADOW Command Qualifiers
- 4-5 F$GETDVI Item Codes for Volume Shadowing
- 5-1 $DISMOU Flag Options
- 5-2 SYS$GETDVI Item Codes
- 6-1 Information in the Storage Control Block (SCB)
- 7-1 Comparison of Minicopy and Full Copy Performance
- 7-2 Comparison of Minicopy and Hardware-Assist (DCD) Copy Performance
- 8-1 Visible Impact of Transient State Events
- 10-1 RAID Levels
List of 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 Creating a Shadow Set and Adding Third Member
- 4-5 Using the /CONFIRM Qualifier
- 4-6 Using the /NPCOPY Qualifier
- 4-7 Reconstructing Shadow Sets With /INCLUDE
- 4-8 SHOW SHADOW Sample Output
- 4-9 ANALYZE/DISK/SHADOW Sample Output
- 4-10 SDA Display of Third-Party SCSI Device
- 5-1 Item List to Create and Mount a Shadow Set
- 5-2 Item List to Add a Member to a Shadow Set
- 5-3 Item List to Create and Mount 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
- 8-1 Using MULTIUSE and DISMOUNT Keywords (I)
- 8-2 Using MULTIUSE and DISMOUNT Keywords (II)