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:
Mar. 20, 2012
Filed:
Dec. 24, 2008
Tatsuo Kumano, Kawasaki, JP;
Yasuo Noguchi, Kawasaki, JP;
Kazutaka Ogihara, Kawasaki, JP;
Masahisa Tamura, Kawasaki, JP;
Yoshihiro Tsuchiya, Kawasaki, JP;
Tetsutaro Maruyama, Kawasaki, JP;
Takashi Watanabe, Kawasaki, JP;
Riichiro Take, Kawasaki, JP;
Kazuichi Oe, Kawasaki, JP;
Minoru Kamosida, Kawasaki, JP;
Shigeyuki Miyamoto, Kawasaki, JP;
Tatsuo Kumano, Kawasaki, JP;
Yasuo Noguchi, Kawasaki, JP;
Kazutaka Ogihara, Kawasaki, JP;
Masahisa Tamura, Kawasaki, JP;
Yoshihiro Tsuchiya, Kawasaki, JP;
Tetsutaro Maruyama, Kawasaki, JP;
Takashi Watanabe, Kawasaki, JP;
Riichiro Take, Kawasaki, JP;
Kazuichi Oe, Kawasaki, JP;
Minoru Kamosida, Kawasaki, JP;
Shigeyuki Miyamoto, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A data allocation control program manages data allocation when data is distributively stored in a plurality of disk nodes that are shifted to a power saving mode unless access is performed for a certain time. The program produces a plurality of allocation pattern candidates each indicating the disk nodes in which the respective data are to be stored. The program calculates a no-access period expectation that represents an expected value of occurrence of a no-access period during which access is not performed to some of the disk nodes. The program selects as an allocation pattern for data reallocation, one of the plurality of produced allocation pattern candidates with the largest calculated no-access period expectation. The program instructs the disk nodes to reallocate the respective data in accordance with the selected allocation pattern.