Hitachi, Ltd.

Hirofumi Ikawa

Nobuyuki Saika

Takahiro Nakano

Hitoshi Kamei

Takeshi Kitamura

Shinichi Moriwake

When receiving a file access from the client, the file access program refers to the mapping table, and processes an access to files of on volumes of RAID groups. The file server analyzes the file access states, and groups the files depending on the access time period, defines the file migration pattern based on the grouping, migrates the files, and then carries out a power management operation like a spin-down/-up operation on the RAID groups based on the migration pattern.

File server, file management system and file management method

For realizing an optimum failover in NAS, this invention provides a computer system including: a first computer; a second computer; a third computer; and a storage device coupled to the plurality of computers via a network, in which: the first computer executes, upon reception of an access request to the storage device from a client computer coupled to the plurality of computers, the requested access; and transmits to the client computer a response to the access request; the second computer judges whether a failure has occurred in the first computer; obtains load information of the second computer; obtains load information of the third computer from the third computer; and transmits a change request to the third computer when the obtained load information satisfies a predetermined condition; and the third computer judges whether a failure has occurred in the first computer when the change request is received from the second computer.

Autonomous takeover destination changing method in a failover

Provided is a computer system which includes plurality of computers including a first, second, and third computers, and a storage device coupled to the plurality of computers via a network, in which: the first computer is configured to: access data in a storage area of the storage device; cut, based on settings information and loads on the plurality of computers, at least a part of electric power supplied to the first computer; and send, before cutting the at least a part of electric power supplied to the first computer, a takeover request to the second computer; and the second computer accesses the data within the storage area after receiving the takeover request. With the configuration as described above, power consumption in NAS is reduced.

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Fujisawa, Japan

Hirofumi Ikawa