Patent ID: 7159074

Claim:
A storage system, comprising: a data storage managing device that manages storage of data which is acquired from another computer through a network; and a storage subsystem including a plurality of disk drives that structure a plurality of parity groups, and a parity group information holding area that holds a warranty expiration date set to the parity groups to which a logical unit is set, wherein the data storage managing device includes a data storage managing module that indicates the storage of data, and a logical unit assigning module that assigns a logical unit that stores the data, wherein the data storage managing module calculates a retention date of the data and requests assignment of the logical unit that stores the data, wherein, upon receiving the assignment request indication of the logical unit, the logical unit assigning module judges whether a logical unit having a free capacity that is equal to or larger than a size of the data to be stored exists in the parity group having the warranty expiration date that is later than the retention date of the data to be stored, when logical units each satisfying the above conditions exist, the logical unit of the parity group having the earliest warranty expiration date among the logical units each satisfying the above conditions is assigned, and when no logical unit that satisfies the above conditions exists, the logical unit of the parity group having the latest warranty expiration date among the logical units each having a free capacity that is equal to or larger than the size of the data to be stored is assigned, wherein the data storage managing module indicates the logical unit that is assigned by the logical unit assigning module to store the data, and wherein the storage subsystem comprises a logical unit assignment executing module that ensures a region that stores the data in the logical unit that is assigned by the logical unit assigning module, and a logical unit access module that stores the data in the ensured region on the basis of the storage indication of the data.