Patent ID: 8086818

Claim:
A storage control system, comprising: a storage control device being adapted to manage a plurality of storage pool areas each comprising a plurality of logical units and being adapted to manage a plurality of storage areas in each of the plurality of storage pool areas, wherein the storage control device is adapted to create, in response to one or more storage pool area generation commands, a first pool associated with a first pool area and having a first allocation size and a first logical unit, and a second pool associated with a second pool area and having a second allocation size and a second logical unit; wherein the storage control device is adapted, in response to a virtual logical volume creation command that includes a received allocation size that comprises one of the first allocation size of the first pool or the second allocation size of the second pool, to create a virtual logical volume managed in association with the received allocation size and either the first pool or the second pool that corresponds thereto, wherein the virtual logical volume can be accessed by one of a plurality of host computers; wherein the storage control device is adapted to allocate to the virtual logical volume, in response to receiving a write request received after the virtual logical volume creation command, a pool area of one of the first logical unit or the second logical unit that is associated with the virtual logical volume to the virtual logical volume in units of the received allocation size and wherein the size of each of the first storage areas is different from that of each of the second storage areas.