HP OpenVMS Systems Documentation
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Volume Shadowing for OpenVMS

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Chapter 7
7 Using Minicopy for Backing Up Data (Alpha)
     7.1     What Is Minicopy?
     7.2     Different Uses for Copy and Minicopy
     7.3     Why Use Minicopy?
     7.4     Procedure for Using Minicopy
     7.5     Minicopy Restrictions
     7.6     Creating Write Bitmaps
         7.6.1         Creating a Write Bitmap With DISMOUNT
         7.6.2         Creating a Write Bitmap With MOUNT
     7.7     Starting a Minicopy Operation
     7.8     Master and Local Write Bitmaps
     7.9     System Parameters for Managing Write Bitmap Messages and Shadow Set Limit
     7.10     Managing Write Bitmaps With DCL Commands
         7.10.1         Determining Write Bitmap Support and Activity
         7.10.2         Displaying Write Bitmap IDs
         7.10.3         Displaying Write Bitmap Status of Cluster Members
         7.10.4         Deleting Write Bitmaps
     7.11     Performance Implications of Write Bitmaps
     7.12     Guidelines for Using a Shadow Set Member for Backup
         7.12.1         Removing a Shadow Set Member for Backup
         7.12.2         Data Consistency Requirements
         7.12.3         Application Activity
         7.12.4         RMS Considerations
             7.12.4.1             Caching and Deferred Writes
             7.12.4.2             End of File
             7.12.4.3             Index Updates
             7.12.4.4             Run-Time Libraries
             7.12.4.5             $FLUSH
             7.12.4.6             Journaling and Transactions
         7.12.5         Mapped Files
         7.12.6         Database Systems
         7.12.7         Base File System
         7.12.8         $QIO File Access and VIOC
         7.12.9         Multiple Shadow Sets
         7.12.10         Host-Based RAID
         7.12.11         OpenVMS Cluster Operation
         7.12.12         Testing
         7.12.13         Restoring Data
         7.12.14         Revalidation of Data Consistency Methods
Chapter 8
8 Performing System Management Tasks on Shadowed Systems
     8.1     Upgrading the Operating System on a System Disk Shadow Set
     8.2     Modifying Data on Individual Shadow Set Members
     8.3     Performing Backup Operations on a Shadow Set
         8.3.1         Restrictions on BACKUP Procedures
         8.3.2         Using Copy Operations to Create a Backup
         8.3.3         Using the OpenVMS Backup Utility
         8.3.4         Using BACKUP/IMAGE on a Shadow Set
     8.4     Crash Dumping to a Shadowed Disk
Chapter 9
9 Performance Information for Volume Shadowing
     9.1     Performance During Steady State
     9.2     Performance During Copy and Merge Operations
         9.2.1         Improving Performance of Unassisted Merge Operations
         9.2.2         Improving Performance for Merge and Copy Operations
         9.2.3         Effects on Performance
     9.3     Guidelines for Managing Shadow Set Performance
     9.4     Striping (RAID) Implementation
Appendix A
Appendix A Messages
     A.1     Mount Verification Messages
     A.2     OPCOM Message
     A.3     Shadow Server Messages
     A.4     VOLPROC Messages
Glossary
Glossary Glossary
Index
Index
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 a Disk to an Existing Shadow Set
4-5 Creating a Shadow Set and Adding Third Member
4-6 Using the /CONFIRM Qualifier
4-7 Using the /NOCOPY Qualifier
4-8 Reconstructing Shadow Sets With /INCLUDE
4-9 Dissolving a Shadow Set
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
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 System, One Adapter)
2-3 Configuration of a Shadow Set (One System, Two Adapters)
2-4 Configuration of a Shadow Set (OpenVMS Cluster, Dual Adapters)
2-5 Configuration of a Shadow Set (Highly Available OpenVMS Cluster)
2-6 Configuration of a Shadow Set (Multiple Star Couplers, Multiple HSJ Controllers)
2-7 Configuration of a Shadowed FDDI Multiple-Site Cluster
2-8 Configuration of a Shadowed Fibre Channel Multiple-Site Cluster
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 Write Bitmap
7-3 Member Returned to the Shadow Set (Virtual Unit)
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 Write Bitmap System Parameters
4-1 MOUNT Command Qualifiers (Shadowing Specific)
4-2 Additional MOUNT Command Qualifiers (Not Shadowing Specific)
4-3 SET DEVICE Command Qualifiers for Multiple-Site Shadow Set Members
4-4 F$GETDVI Item Codes 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)
7-1 Comparison of Minicopy and Full Copy Performance
7-2 Comparison of Minicopy and Hardware-Assist (DCD) Copy Performance
9-1 RAID Levels
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