Patent ID: 8949536
Filing Date: 2015-02-03
Classification: G06F

Abstract:
1. A computer program product for maintaining a copy relationship between tracks in a source storage and a target storage and communicating with a cache device, the computer program product comprising a computer readable storage medium having computer readable program code embodied therein that executes to perform operations, the operations comprising: maintaining a point-in-time copy relationship associating tracks in the source storage with tracks in the target storage, wherein the target storage stores the tracks in the source storage as of a point-in-time; receiving a write request including an updated source track for a point-in-time source track in the source storage in the point-in-time copy relationship, wherein the point-in-time source track was in the source storage at the point-in-time the copy relationship was established; storing the updated source track in the cache device; and sending a prefetch request to the source storage to prefetch the point-in-time source track in the source storage subject to the write request before destaging the updated source track to the source storage.