Patent ID: 7124128

Claim:
A computer implemented method for managing data, comprising: receiving a data request to a target track in a copy relationship, wherein the copy relationship associates a source track with the target track, wherein the source and target tracks are maintained in at least one storage medium; submitting a destage request to destage the source track in response to the data request to the target track, wherein executing the data request to the target track is conditioned on receiving a complete response to the destage request; if the source track is not in a cache, returning the complete response to the destage request, wherein the cache is implemented in at least one computer readable medium; if the source track was in the cache when the copy relationship was established, adding the destage request to an Input/Output (I/O) queue for the source track; and after the source track is destaged in response to processing the destage request in the I/O queue, returning the complete response to the destage request.