Patent ID: 8566530
Filing Date: 2013-10-22
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 first cache device and a second 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 first cache device; 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 to the second cache device; generating a read request to read the source track in the source storage following the sending of the prefetch request; and copying the read source track to a corresponding target track in the target storage.