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FlashCopy
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<p>FlashCopy is an <a href="/facts/IBM/QszA7nwd">IBM</a> feature supported on various IBM storage devices that made it possible to create, nearly instantaneously, point-in-time <a href="/facts/Snapshot_(computer_storage)/LKm3NX2A">snapshot</a> copies of entire logical volumes or data sets. The <a href="/facts/Hitachi_Data_Systems/qYvQecjX">Hitachi Data Systems</a> implementation providing similar function was branded as ShadowImage. Using either implementation, the copies are immediately available for both read and write access. </p>