The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 04, 2009
Filed:
Jul. 26, 2005
Hirofumi Sahara, Yokohama, JP;
Hiroshi Morishima, Yokohama, JP;
Makoto Aoki, Kawasaki, JP;
Osamu Kohama, Yokohama, JP;
Satoshi Kadoiri, Chigasaki, JP;
Isao Nagase, Ebina, JP;
Hirofumi Sahara, Yokohama, JP;
Hiroshi Morishima, Yokohama, JP;
Makoto Aoki, Kawasaki, JP;
Osamu Kohama, Yokohama, JP;
Satoshi Kadoiri, Chigasaki, JP;
Isao Nagase, Ebina, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Software Engineering Co., Ltd., Kanagawa, JP;
Abstract
Provided is a computer system which includes computers and a storage system coupled to the computers. The storage system includes a first load measuring module that measures a first access load for each channel adaptor. At least one of the computers includes a path management module that manages paths through which the computers access logical units. The path management module includes a second load measuring module that measures a second access load imposed by access from the computer to the logical unit, and an active path setting module that selects one of the channel adaptors based on the first access and the second access load measured by the first and second load measuring modules, and setting an active path passing through the channel adaptor. Thus, a load on an entire system is balanced, thereby improving performance while a cache hit rate of a storage system is maintained.