METHOD FOR OPTIMIZING CLEANING OF MAPS IN FLASHCOPY CASCADES CONTAINING INCREMENTAL MAPS

摘要

way to type on a computer readable medium including programmed instruction as having a It is implemented in a computer infrastructure having computer executable code. The programming instructions are operable to determine the target disk of the map contains data whether the downstream disk is not available from within an upstream disc and the FlashCopy cascade and detect whether the downstream disk has a copy of the data It is. Also, if the target disk of the map does not have a copy of the data which the downstream disk contains the downstream disk is the unavailable data from the upstream disk, the program commands the data from the target disk It is operable to copy to the downstream disk. Also, if the map of the target disk is Having a copy of the downstream disk has the data does not include data downstream from the upstream disk, the disk is not available, the programming commands from the target disk to the downstream disk, the operable to avoid the copy data. In addition, the programming instructions are operable to remove the map from the FlashCopy cascade. ;