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IBM System Storage N series Software Guide by Marco Schwarz, Tom Provost, Steven Pemberton, Dirk Peitzmann, Jeff Lin, Roland Tretau

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What storage efficiency is
This chapter introduces storage efficiency, which includes technologies such as FlexVol volume, Snapshot copy, deduplication, SnapVault, SnapMirror, and FlexClone. These technologies help to increase storage utilization and decrease storage costs.
Storage efficiency enables you to store the maximum amount of data for the lowest cost and accommodates rapid data growth while consuming less space. IBM N  series strategy for storage efficiency is based on the built-in foundation of storage virtualization and unified storage ...

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