Patent ID: 7356623

Claim:
A system comprising: a plurality of storage devices; and a control unit for controlling read/write of data requested by a plurality of host processors into the plurality of storage devices, using a plurality of logical storage areas constituted by storage areas of the plurality of storage devices, wherein, when a first host processor included in the plurality of host processors issues a read request of data from a first storage area constituted by a range different from the logical storage areas, the control unit forces processing in response to a read request of data from the first storage area issued by a second host processor included in the plurality of host processors to wait, and wherein the control unit is operable to accept or delay the read request or a write request by utilizing the first storage area if information received by the control unit from the second host processor includes information as to the first storage area, and the control unit is operable to accept or delay the read request or the write request by utilizing the logical storage areas if the information from the second host processor does not include the information as to the first storage area.