Patent ID: 7082503

Claim:
A storage system adapted to be coupled to a plurality of host computers, said storage system comprising: a plurality of disk drives storing data from said host computers, said disk drives are divided into a plurality of storage areas each to be identified with a storage area number; and a controller controlling read/write of data from/to said disk drives in response to accesses from said host computers, wherein said controller includes an access management map which includes an identification of a host group having been grouped to include some of said host computers selected from said host computers by an user, a plurality of identifications of said host computers grouped into groups according to types of said host computers and a plurality of renumbered identifications of a plurality of logical units, said renumbered identifications of said logical units being formed by renumbering said storage area numbers, and wherein said controller controls accesses from said host computers to said logical units in accordance with said access management map.