Patent ID: 7953947
Filing Date: 2011-05-31
Classification: G06F

Abstract:
1. A storage system comprising: a first storage system including: a second storage system including: wherein the first processor transfers the data stored in the first data area of the first volume in the first storage system, to the second storage system, and the second processor stores the data in the second data area of the second volume, wherein after the first processor transfers the data stored in the first data area to the second storage system, the first processor transfers the first marker stored in the first marker area to the second storage system, and the second processor stores the first marker in the second marker area of the second volume, wherein the second processor checks whether transferring the data stored in the first data area and the first marker stored in the first marker area to the second storage system, is completed, wherein the second processor checks whether the first marker stored in the second storage area of the second volume corresponds to a second marker designated by the computer, and wherein, if transferring the data stored in the first data area and the first marker stored in the first marker area to the second storage system is completed and the first marker stored in the second storage are of the second volume is a second marker designated by the computer, the second processor creates a snapshot of the data that is stored in the second data area, in the third storage volume.