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4Creating and Managing Shadow Sets Using DCL Commands   



This chapter describes how to create, mount, dismount, and dissolve shadow sets using interactive DCL commands. It also describes how to use the DCL command SET DEVICE to specify management attributes for shadow set members located at different sites in a multiple-site OpenVMS Cluster system. In addition, it describes how to use the DCL command SHOW DEVICE and the lexical function F$GETDVI to access current information about the state of shadow sets.

Volume Shadowing for OpenVMS improves data availability by ensuring that corresponding logical block numbers (LBNs) on multiple disk volumes contain the same information. Upon receiving a command to mount or dismount disks in a shadow set, the volume shadowing software may need to reconcile data differences and ensure that corresponding LBNs contain the same information.

An understanding of the copy and merge operations used for data reconciliation is essential to the discussions in this chapter. Therefore, you may find it helpful to refer to Ensuring Shadow Set Consistency to understand how Volume Shadowing for OpenVMS ensures data availability and consistency during changes in shadow set membership.

skip links to sections within this chapter.
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
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go to next page: Allocating DevicesAllocating Devices