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:
Jun. 26, 2012
Filed:
Dec. 18, 2009
Masanori Takata, Yokohama, JP;
Hitoshi Kamei, Sagamihara, JP;
Atsushi Sutoh, Yokohama, JP;
Takahiro Nakano, Yokohama, JP;
Nobumitsu Takaoka, Sagamihara, JP;
Akio Shimada, Yokohama, JP;
Masanori Takata, Yokohama, JP;
Hitoshi Kamei, Sagamihara, JP;
Atsushi Sutoh, Yokohama, JP;
Takahiro Nakano, Yokohama, JP;
Nobumitsu Takaoka, Sagamihara, JP;
Akio Shimada, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to provide HSM that can effectively use the storage capacity of an upper Tier in an HSM system, a lower Tier of the HSM system detects a group of files having the same data content from a plurality of files stored in the lower Tier, and keeps at least one of the real data of the group of files having the same data content while deleting the rest of the data. The upper Tier receives the process result from the lower Tier. Then, in response to a read request from the host computer that specifies a file included in the group of files and transferred to the upper Tier from the lower Tier, the upper Tier identifies the at least one of the data that is kept and corresponding to the specified file, and responds to the host computer.