Patent ID: 8775753

Claim:
A computer program product stored on a non-transitory computer readable medium, the computer program product configured to: maintain a bitmap for storage devices on a local site, each storage device comprising a plurality of local tracks, wherein each local track is associated with a change indicator in the bitmap that indicates a change in data when set; receive a withdraw command initiated by a user for a logical copy relationship between a local source track and a local target track on a local site, wherein the withdraw command causes the logical copy relationship between the local source track and the local target track to terminate on the local site; send the withdraw command to a remote site buffer; transfer the withdraw command from the remote site buffer to the remote site; and for one or both of the local source track and the local target track in the logical copy relationship that is a subject of the withdraw command, set the change indicator in response to receiving the withdraw command for the logical copy relationship.