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7Using Minicopy for Backing Up Data (Alpha)   



This chapter describes the minicopy feature of Volume Shadowing for OpenVMS introduced in OpenVMS Version 7.3. Minicopy and its enabling technology, write bitmaps, are fully implemented on OpenVMS Alpha systems. OpenVMS VAX nodes can write to shadow sets that use this feature but they can neither create master write bitmaps nor manage them with DCL commands. In a mixed-architecture OpenVMS Cluster system, only one Alpha system is required in order to use minicopy.

The primary purpose of minicopy is to shorten the time it takes to return a shadow set member to the shadow set. The shadow set member is typically removed for the purpose of backing up the data and is then returned to membership in the shadow set.

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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
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