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IBM XIV Storage System Business Continuity Functions by Christian Schoessler, Patrick Schill, Sandor Lengyel, Wenzel Kalabza, Christian Burns, Bertrand Dufrasne

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Snapshots
A snapshot is a point-in-time copy of a volume’s data. The XIV snapshot uses several innovative technologies to ensure minimal impact on system performance. Snapshots are space-efficient, make use of pointers, and only contain partitions with data that has changed from the original volume. If a partition has not changed, both the snapshot and the volume point to the same partition. They efficiently share cache for common data, effectively working as a larger cache than is the case with full data copies.
A volume copy is an exact copy ...

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