Hitachi, Ltd.

Ryu Gemba

Atsushi Kondo

Shotaro Ohno

Kenichi Shimooka

Shinya Takeuchi

Hiroshi Yokouchi

Kazuhiro Oyama

Tomohiro Sonomura

Naoki Haramai

Provided is a method of controlling a computer system that includes: a computer; a first storage device connected to the computer via a first path and a second path; and a second storage device externally-connected to the first storage system via a third path and connected to the computer via a fourth path, the first storage device providing a first storage area to the computer, the second storage device including a second storage area corresponding to the first storage area, the method including: judging whether or not a fault has occurred in at least one of the first to fourth paths; selecting, a path used for access to the first or second storage area; and transmitting the access request for the first or second storage area by using the selected path. Accordingly, in the computer system, an application can be prevented from being stopped despite a fault in a path.

Method of managing paths for an externally-connected storage system and method of detecting a fault site

A plurality of storage devices connected to at least one host computer via a network is to be managed. Access information about accesses from the host computer to each of the storage devices is referred to; a storage area in the storage device that has low access efficiency is determined based on the access information; a host computer having low access efficiency in view of the storage area having low access efficiency is determined based on the access information; a storage area having high access efficiency at least from the host computer having low access efficiency is determined; and data that is stored in the storage area having low access efficiency and used by the host computer having low access efficiency is transferred to the storage area having high access efficiency.

Information processing method and system

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Yokohama, Japan

Ryu Gemba