Patent ID: 7594137
Filing Date: 2009-09-22
Classification: G06F

Abstract:
1. A storage system including a first storage sub system having a first logical volume, comprised of a thin provisioning volume, where a first data area is dynamically allocated to prescribed areas, and which stores data transmitted from a host computer in said first data area, and a second storage sub system, which does not include a thin provisioning volume, having a second data area for backing up said first logical volume; wherein said first storage sub system comprises: a first management unit for managing the status of said first data area allocated to each of said prescribed areas of said first logical volume; a transfer unit for transferring said data stored in said first data area allocated to each of said prescribed areas of said first logical volume to said second storage sub system; and a restoration unit for restoring said first logical volume based on the status of said first data area managed by said first management unit and/or data transferred from said second storage sub system, wherein, during restoring of said first logical volume, real areas of said first logical volume are allocated only to portions of said first data area where data has been written from said host computer to said first data area.