Hitachi, Ltd.

Masaru Orii

Atsushi Tanaka

Takao Terayama

Kazuo Sakai

Fujio Tajima

Tomokazu Ishii

Kooetsu Okuyama

Tadashi Honzawa

The present invention makes it possible to dynamically and optimally change QoS while taking the balance of a system as a whole into consideration. With the present invention, communications parameters comprising band allocation information with respect to a plurality of interfaces of communications paths are set at a management device, and a host device, a switch device, and a storage device communicate based on the communications parameters that have been set. Then, in the system operation stage, the management device or the switch device acquires statistical information comprising band usage amounts with respect to the communications paths among a port of the host device, a port of the storage device, and a port, of the switch device, changes, based on the statistical information, the band allocation that has been set with respect to the plurality of interfaces, and, further, determines whether or not the band allocation as changed is appropriate with respect to the system (see FIG.).

Computer system and management method thereof

A first network deviceand a second network devicetransmits a test frame and its response frame therebetween. The first network deviceacquires a test frame transmission start time, a response frame reception completion time, a test frame reception completion time, and a response frame transmission start time, and calculates, based on the times thus acquired, a PAUSE frame action delayed period that indicates a time period required for a PAUSE frame transmitted from the first network deviceto actually act on the second network device, and sends from the first network deviceto the second network devicea PAUSE frame in which a time period calculated based on the PAUSE frame action delayed period is set as a PAUSE period in order to prevent shortage of a receive bufferin the first network devicefrom causing a loss of frames transmitted from the second network device

Network device and method of controlling network device

An information processing apparatus that enables easy identification of the cause of failure. The information processing apparatus has a transfer unit for transferring data between first equipment and second equipment. The information processing apparatus further includes an collection unit for collecting data that passes between the first equipment and the transfer unit as well as data that passes between the transfer unit and the second equipment and a first storage unit for storing the data collected by the collection unit.

Storage system, adapter apparatus, information processing apparatus and method for controlling the information processing apparatus

A tape cartridge is received into one end of an information recording and/or reproducing apparatus conforming to an 8 inch Form Factor Size. A first reel is held inside this tape cartridge, and a tape wound onto this first reel is extracted from a cartridge including the first reel and threaded by a simple pivotal motion of a tape threading arm, and wound onto a second reel disposed at the other end of the information recording and/or reproducing apparatus. The pivotal center of the tape threading arm and a recording head are disposed at opposite sides respectively with regard to a line joining a first and second reel axes to facilitate a compact overall construction. Tape guides formed into cylindrical rollers and the recording head are disposed on the inner side of the trajectory of the tape threading to transfer the tape smoothly. The tape guides and the recording head may be arranged substantially in line. Also, the tape guides next to the recording head may be fixed rollers.

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Yokohama, Japan

Masaru Orii