Flash copy is a point-in-time image copy that takes up only 20% of the space from the source and contains only metadata, not data. Flash copies are useful when environments have many hits since they require less space and time than full copies. A repository LUN stores the FlashCopy metadata and any copy-on-write data, with a default capacity of 20% of the base LUN.

2. •What is Flash copy
•Why we need Flash copy
•What is Repository lun?
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3. What is Flash copy
•Pointing time image copy
•It takes only 20% of space from
the source lun
•It cointains only the meta data
not the data
•It consumes very less time and space
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4. Why we need Flash copy
•If in the environment contain more hits
so we need Flash copy
•It requires less space
•It requires less time
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5. What is Repository lun?
•The FlashCopy repository logical drive is
created to store FlashCopy metadata
and any copy-on-write data
•By default the FlashCopy repository
logical drive’s capacity is 20% of the
base logical drive's capacity.
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