Hitachi, Ltd.

Tatsuo Nishibori

Akira Murotani

Nobuyuki Saika

Disclosed is a storage system that includes a first node and a second node. The first node and the second node are connected to a client and a storage device. The first node includes a first memory for cache data, receives data from the client, stores the data into the first memory, and controls the storing the content of the data into the storage device from the first memory in accordance with an instruction from the second node. The second node includes a second memory for the same cache data as the first memory. If the content of data in the storage device or the content of data in the second memory before the storing of the data is the same as the content of the data in the second memory, the second node instructs the first node not to store the content of the data into the storage device.

File server, file server control method, and storage system

A replication system capable of automatically forming an authentic copy pair with a primary volume at a copy destination system without depending on an operator and realizing the pair formation without labeling a tape is provided. A system for performing initial copying of data of a copy source volume from a portable storage medium storing the data of the copy source volume to a copy destination volume is characterized in that the portable storage medium stores management information about the copy source volume, wherein a system to which the copy destination volume belongs copies data of the portable storage medium to copy destination volume information, reads the management information from the copy destination volume, and sends it to a system to which the copy source volume belong; and this system judges whether these pieces of information are authentic or not; and if an affirmative judgment is returned, it is determined that the copy source volume and the copy destination volume constitute an authentic copy pair.

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Tokyo, Japan

Tatsuo Nishibori