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:
Jan. 16, 2007
Filed:
Apr. 30, 2004
Akihiko Sakaguchi, Tachikawa, JP;
Masaaki Iwasaki, Tachikawa, JP;
Akihiko Sakaguchi, Tachikawa, JP;
Masaaki Iwasaki, Tachikawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
This invention enables a file to be accessed even during replication while maintaining its consistency. The replication is done among a plurality of distributed storage devices, a file is searched, in response to an access request from a client machine #, from GUID management databaseseach of which stores a relationship between a GUID of a file stored in a storage device #(#) and a device ID of a storage device containing an original file. When the storage device #does not have the demanded file, a device ID (#) of a storage device containing its original file is searched from the GUID management database based on a GUID of the file C, and the file C demanded by this the storage device #is accessed.