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Emulation of third-mirror break-off snapshots

Third-mirror break-off snapshots are suitable for write-intensive volumes (such as for database redo logs) where the copy-on-write mechanism of space-optimized or full-sized instant snapshots might degrade the performance of the volume.

If you use the vxsnap prepare command to enable a volume for use with instant and space-optimized snapshots, you cannot use the vxassist snapshot commands to administer snapshots that you create for the volume. If you require snapshots that behave as third-mirror break-off snapshots (that is, they must be fully synchronized before they can be used), there are three ways to achieve this:

See "Adding snapshot mirrors to a volume" on page 317.

See "Creating and managing third-mirror break-off snapshots" on page 311.