Hitachi, Ltd.

Toshiki Kamohara

Eiichi Sato

Masafumi Nozawa

Shiori Inoue

Naoto Yanagi

By considering a device life and time needed for data migration, data stored in a storage apparatus is securely preserved until a retention term of each of the data. Multiple disk devicesA toC that store a data file generated by a service server apparatusare included. A migration managerof a management server apparatusacquires preservation period information that indicates a preservation period of the data file from the service server apparatus, and calculates a preservation term of the data file based on the preservation period information. The migration managerof the management server apparatusalso acquires data amount information of the data file from the service server apparatus, and calculates a necessary time needed for migrating the data file to other disk devices AA toC. When the preservation term comes later than an operation guarantee term recorded in advance for each of the disk devicesA toC, the migration managerof the management server apparatuscompares the end of the migration with the operation guarantee term, and determines the necessity of the migration.

Storage system and method for operating storage system

This storage system collectively manages a plurality of types of file groups reaching storage time limit, and carries out data migration spanning a plurality of storage devices. Based on the respective file information, of the respective files distributed among the respective volumes, files, whose storage time limit arrives within a prescribed period of time, are grouped together as a migration group. The storage term of the group is made to coincide with the file having the most distant storage time limit of the respective files. A first migration is carried out on the basis of the priority of the respective storage devices. A second migration is executed on the basis of the device life of the respective storage devices and the storage term of the group.

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Odawara, Japan

Toshiki Kamohara