Hitachi, Ltd.

Kazuhiro Oyama

Mutsuhiro Mori

Yoshihiko Koike

Katsuaki Saito

Hiroshi Yokouchi

Atsushi Kondo

Ryu Gemba

Naoki Haramai

Jyunichi Sakano

A storage apparatus includes multiple ports communicable with a server, multiple processor cores and multiple LUs (Logical Units). For each port, a port responsible core, which is a processor core to accept an I/O request received by the port, is specified. For each LU, an LU responsible core, which is a processor core responsible for I/O, is specified. The LU responsible core may be dynamically changed. The server periodically acquires identification information about the LU responsible cores from the storage apparatus. When transmitting an I/O request, the server selects a non-cross call path, which is such a path that the LU responsible core and the port responsible core are the same processor core, from among multiple paths to an I/O destination LU, which is an LU specified by the transmission target I/O request, and transmits the transmission target I/O request via the selected path.

Computer system and data input/output method

An elastic printed board is provided so that stress applied by the silicon gel is absorbed by the printed board. Further, the printed board is formed to be so narrow that the stress can escape. On the other hand, the wires on which a high voltage is applied are patterned on respective printed boards. This serves to prevent discharge through the surface of the same printed board serving as a current passage. This design makes it possible to hermetically close the power module, prevent intrusion of moisture or contamination as well as displacement, transformation and cracks of the cover plate.

Power semiconductor module and fabrication method thereof

An elastic printed board is provided so that stress applied by the silicon gel is absorbed by the printed board. Further, the printed board is formed to be so narrow that the stress may be escaped. On the other hand, the wires on which a high voltage is applied are patterned on respective printed boards. This serves to prevent discharge through the surface of the same printed board served as current passage. This design makes it possible to hermetically close the power module, prevent intrusion of moisture or contamination as well as displacement, transformation and crack of the cover plate.

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.

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Hadano, Japan

Kazuhiro Oyama