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:
May. 01, 2012
Filed:
Apr. 03, 2009
Hirofumi Ikawa, Fujisawa, JP;
Nobuyuki Saika, Yokosuka, JP;
Shinichi Moriwake, Yokohama, JP;
Hitoshi Kamei, Sagamihara, JP;
Takahiro Nakano, Yokohama, JP;
Hirofumi Ikawa, Fujisawa, JP;
Nobuyuki Saika, Yokosuka, JP;
Shinichi Moriwake, Yokohama, JP;
Hitoshi Kamei, Sagamihara, JP;
Takahiro Nakano, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When receiving a file access from the client, the file access program refers to the mapping table, and processes an access to files of on volumes of RAID groups. The file server analyzes the file access states, and groups the files depending on the access time period, defines the file migration pattern based on the grouping, migrates the files, and then carries out a power management operation like a spin-down/-up operation on the RAID groups based on the migration pattern.