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:
Sep. 08, 2009
Filed:
Aug. 16, 2002
Shinji Fujiwara, Sagamihara, JP;
Nobutoshi Sagawa, Koganei, JP;
Tetsuya Uemura, Sayama, JP;
Hiroaki Odawara, Kodaira, JP;
Shinji Fujiwara, Sagamihara, JP;
Nobutoshi Sagawa, Koganei, JP;
Tetsuya Uemura, Sayama, JP;
Hiroaki Odawara, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The invention relates to a method of virtualizing a plurality of network storages into a single-view file system for a client and obtains information about an object's storage location without inquiring of a resource manager. The method determines a network storage that should store an object based on a hash value generated from a logical identifier for the object to be accessed. While accessing the object, the method computes the hash value for the object's logical identifier to determine a network storage that should process an access request. Consequently, the method eliminates the need to inquire the object's storage location when the access request is issued. Further, the method eliminates the need to maintain the object's storage location when the number of servers is increased or decreased, thus providing easy management.