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Snapshot volume

Snapshot images are not directly accessible for either read or write operations by a host. To provide a host access to snapshot images stored within a snapshot group repository volume, you must create a snapshot volume.

When you create a snapshot volume, you can designate the volume as either read-only or read-write. A read-write snapshot volume requires an associated repository to provide the host application with write access to a copy of the data contained in the snapshot image. Any modifications made by the host application to the snapshot image are saved in this repository to allow the data of the original snapshot image to remain unchanged.

An administrator must monitor the utilization of a snapshot volume to ensure that ongoing write operations for the base volume are handled properly. The storage management software provides mechanisms for viewing the current utilization of a repository volume and remaining free space of a snapshot volume, and for managing alert thresholds that trigger notification when utilization reaches configured levels.

Every snapshot volume has a direct association with a base volume.