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Product: Volume Manager Guides | |
Manual: Volume Manager 4.1 Administrator's Guide |
Emulation of Third-Mirror Break-Off SnapshotsThird-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:
![]() The plexes in a volume with a stripe-mirror layout are mirrored at the sub-volume level, and cannot be broken off. See Creating Instant Snapshots for details of the procedures for creating and using this type of snapshot. For information about how to add snapshot mirrors to a volume, see Adding Snapshot Mirrors to a Volume. |
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Manual: Volume Manager 4.1 Administrator's Guide | |
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