Abstract: A shared device unit, which comprises a storage device, is coupled to a plurality of storage systems. The shared device unit provides a plurality of storage areas, which are based on the storage device, to the plurality of storage systems. Each storage system stores allocation management information which comprises an ID of a storage area provided to thereof among the plurality of storage areas, and provides the storage area corresponded to the ID included in the allocation management information to the host computer coupled thereto among the plurality of host computers.

Abstract: The storage apparatus comprises a storage unit storing data read/written by the host apparatus, and a control unit controlling writing of the data to the storage unit. The control unit configures one or more pools from the storage unit and divides one of the pools into first pages having an area of a first size and divides the first pages into second pages having the second area, and manages the pages, manages a data storage area of a first volume storing the data by using the first-size area and manages a data storage area of a second volume storing the data by using the second-size area, assigns the first page to the data storage area of the first volume, and assigns the first page in units of the second volume and assigns the second page obtained by dividing the first page to the data storage area of the second volume.

Abstract: The storage apparatus comprises a storage unit storing data read/written by the host apparatus, and a control unit controlling writing of the data to the storage unit. The control unit configures one or more pools from the storage unit and divides one of the pools into first pages having an area of a first size and divides the first pages into second pages having the second area, and manages the pages, manages a data storage area of a first volume storing the data by using the first-size area and manages a data storage area of a second volume storing the data by using the second-size area, assigns the first page to the data storage area of the first volume, and assigns the first page in units of the second volume and assigns the second page obtained by dividing the first page to the data storage area of the second volume.

Abstract: A shared device unit, which comprises a storage device, is coupled to a plurality of storage systems. The shared device unit provides a plurality of storage areas, which are based on the storage device, to the plurality of storage systems. Each storage system stores allocation management information which comprises an ID of a storage area provided to thereof among the plurality of storage areas, and provides the storage area corresponded to the ID included in the allocation management information to the host computer coupled thereto among the plurality of host computers.

Abstract: Pages having different management sizes are efficiently stored in the same pool. The storage apparatus comprises a storage unit which stores data that is read/written by the host apparatus, and a control unit which controls writing of the data to the storage unit, wherein the control unit configures one or two or more pools from the storage unit and divides one of the pools into first pages having an area of a first size and divides the first pages into second pages having the second area, and manages the pages, manages a data storage area of a first volume storing the data by using the first-size area and manages a data storage area of a second volume storing the data by using the second-size area, assigns the first page to the data storage area of the first volume, and assigns the first page in units of the second volume and assigns the second page obtained by dividing the first page to the data storage area of the second volume.