Hitachi, Ltd.

Tetsuya Kishimoto

Akira Murotani

Atsushi Ishikawa

Kenichi Takamoto

Kenji Muraoka

Hidehiko Iwasaki

Akemi Sanada

Naoki Hino

Toshiya Nakano

A journal write unit writes journal data into a third storage device. The journal data includes an identifier of a logical volume in a first storage device into which data has been written, information of a location in which the data is stored in the logical volume, update time which is current time acquired from a timing mechanism, and the data. A second write unit refers to update time of the journal data stored in the third storage device, selects journal data for which a difference between current time acquired from the timing mechanism and the update time is longer than a detection time stored in the third storage device, and writes the data into a place indicated by the location information, in a logical volume in the second storage device in the order of update time in the selected journal data.

Disk array apparatus and disk array apparatus control method

A storage controller determines a difference between a control table containing fiber channel port configuration of an upper node device and security information, and information fetched from a name server, thereby detecting replacement of a fiber channel port and correcting the control table. This enables data input/output in the same way as before fiber channel port replacement without consciously modifying the security information.

Storage controller and computer system for managing information related to connection port

For providing a storage control unit to be connected to a fiber channel, in which a new storage control unit is added onto the fiber channel network during on-line operation and succeeds control information of a logical unit from the storage control unit which has been existing before, so as to be in charge of a process request issued to that logical unit from a host computer thereafter, wherein a control memory being able to memorize the control information is provided in each of the storage control unitsand, which information is necessary when succeeding or taking over the logical unit and is represented by such as construction information of a magnetic disk drive within a disk drive unitand construction information of the logical unit, so on. The contents of the control memory within the storage control unitis copied into the control memory of the storage control unitwhen the new storage control unitis added onto the fiber channel network.

Storage control unit and method for handling data storage system using thereof

For providing a storage control unit to be connected to a fiber channel, in which a new storage control unit is added onto the fiber channel network during on-line operation and succeeds control information of a logical unit from the storage control unit which has been existing before, so as to be in charge of a process request issued to that logical unit from a host computer thereafter, wherein a control memory being able to memorize the control information is provided in each of the storage control units and , which information is necessary when succeeding or taking over the logical unit and is represented by such as construction information of a magnetic disk drive within a disk drive unit and construction information of the logical unit, so on. The contents of the control memory within the storage control unit is copied into the control memory of the storage control unit when the new storage control unit is added onto the fiber channel network.

Growing community of inventors

Odawara, Japan

Tetsuya Kishimoto