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IBM DS8870 Copy Services for Open Systems by Bertrand Dufrasne, Sherri Brunson, Don Skilton, Warren Stanley, Alexander Warmuth, Mark Wells

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FlashCopy overview
FlashCopy creates a copy of a volume at a specific point-in-time. FlashCopy is also known as a Point-in-Time copy, instantaneous copy, or time-zero copy (t0 copy).
This chapter explains the basic characteristics of FlashCopy when used in an Open Systems environment with the DS8000. This chapter describes the following topics:
FlashCopy operational areas
FlashCopy basic concepts
FlashCopy in combination with other Copy Services
FlashCopy SE (Space-Efficient)
FlashCopy with thin-provisioned Extent-Space-Efficient (ESE) ...

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