Patent ID: 7506116
Filing Date: 2009-03-17
Classification: G06F,Y10S

Abstract:
1. A method, comprising: establishing a first logical copy of a data group in a source storage at a first point-in-time, wherein the first logical copy maintains data to reconstruct the data group as of the first point-in time after the data group has been updated following the first-point-in time, wherein the first logical copy further indicates updates to the data group after the first point in time; copying the data group from the source storage to the target storage; indicating regions of the data group updated at the storage after establishing the first logical copy in a change list; applying the updates in the change list to the data group at the source storage to provide the data group at the target storage as of a second point in time; establishing a second logical copy of the data group in the source storage at the second point-in-time, wherein the second logical copy maintains data to reconstruct the data group as of the second point-in-time after the data group has been updated following the second point-in-time, wherein the second logical copy further indicates updates to the data group after the second point-in-time; and establishing a third logical copy of the data group in the target storage at the second point-in-time, wherein the third logical copy maintains data to reconstruct the data group at the target storage as of the second point-in-time after the data group has been updated following the second point-in time, wherein the third logical copy further indicates updates to the data group at the target storage after the second point-in-time.