Hitachi, Ltd.

Tomohiro Takei

Tomohiro Kawaguchi

Hideo Saito

Keishi Tamura

Ken Tokoro

Yohey Ishikawa

A storage system according to one preferred embodiment of the present invention is composed of at least a first storage subsystem and a second storage subsystem. Write data from a host computer is duplicated to a first volume of the first storage subsystem and a second volume of the second storage subsystem, and the host computer is composed to be able to access both the first volume and the second volume. Attribute information which is information related to an order of write and/or write capability is set for each volume, and when an access command to the volume is received from the host computer, the storage subsystem determines whether I/O to the first volume and/or the second volume is required or not based on the attribute set for each volume.

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Tokyo, Japan

Tomohiro Takei