Patent ID: 9405704
Filing Date: 2016-08-02
CPC Classification: G06F

Claim Text:
1. A computer program product for copying data involving at least one storage, wherein the computer program product comprises a non-transitory computer readable storage medium having computer readable program code embodied therein that executes to cause operations, the operations comprising: processing a point-in-time (PiT) copy establish command specifying a source set comprising a subset of source logical addresses in a source volume in the at least one storage and a target set comprising a subset of target logical addresses in a target volume in the at least one storage, wherein the target set of target logical addresses maps to only a portion of at least one of a first target track and a last target track of the target tracks, wherein the source set of source logical addresses are copied to the target set of target logical addresses, wherein the source logical addresses map to source tracks and wherein the target logical addresses map to target tracks; generating, in response to processing the PiT copy establish command, copy information by: copying the source logical addresses that map to at least one of the first target track and the last target track to at least one of the first target track and the last target track; and returning complete to the PiT copy establish command after generating the copy information and before copying all the source logical addresses to the target logical addresses.