Patent ID: 8892847

Claim:
A storage apparatus which is connected via a network to a host apparatus which requests data writing, the storage apparatus comprising: at least one 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 is configured to: provide at least one pool from the storage unit and divide one of the at least one pool into a plurality of first pages having an area of a first size, provide a plurality of volumes including a first volume and a second volume to the host apparatus, in response to a first write request to the first volume, allocate a first one of the first pages to the data storage area of the first volume and store data of the first write request to the allocated first one of the first pages in a unit of a first page size, and in response to a second write request to the first volume, allocate a second one of the first pages to the second volume and further allocate at least one second page, which is obtained by dividing the second one of the first pages allocated to the second volume, to the data storage area of the second volume and store data stored in the storage area indicated by the second write request to the allocated second page in a unit of a second page size.