Patent ID: 8688937
Filing Date: 2014-04-01
Classification: G06F

Abstract:
1. A method implemented in a computer infrastructure having computer executable code tangibly embodied on a computer readable storage medium having programming instructions operable to: determine whether a target disk of a map contains data unavailable to a downstream disk from an upstream disk in a FlashCopy cascade; determine whether the downstream disk has a copy of the data; copy the data from the target disk to the downstream disk based on a determination that the target disk of the map contains data unavailable to the downstream disk from the upstream disk and based on a determination that the downstream disk does not have the copy of the data; refrain from copying the data from the target disk to the downstream disk based on a determination that the target disk of the map does not contain data unavailable to the downstream disk from the upstream disk or based on a determination that the downstream disk does have the copy of the data; and remove the map from the FlashCopy cascade, wherein the map is an incremental map comprising: and wherein: