Patent ID: 6948015

Claim:
A storage control device connected to an external apparatus for exchanging data therebetween, said storage control device comprising: a plurality of logical devices, each of which is associated with one of a plurality of identifiers, the number of which does not exceed a predetermined number, the plurality of logical devices including a group of logical devices for system use; an input/output module configured to receive a data input/output request with one of said identifiers from said external apparatus and to input/output data to/from the logical device that corresponds to the identifier; and an execution module; wherein said storage control device is configured to form a plurality of identifier groups, each of which includes said predetermined number or less of said identifiers and is given one of a plurality of first IDs, each said first ID identifying a group of logical devices different from the group of logical devices for system use; wherein said input/output module is configured to receive a data input/output request with one of said identifiers as well as one of said first IDs from said external apparatus; and wherein said execution module is configured to input/output data to/from the logical device that corresponds to the identifier and is included in the identifier group that corresponds to the first ID.