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:
Apr. 08, 2008
Filed:
Sep. 28, 2004
Masanori Araki, Odawara, JP;
Masatoshi Baba, Odawara, JP;
Yuji Sueoka, Odawara, JP;
Isamu Kurokawa, Odawara, JP;
Hisaharu Takeuchi, Odawara, JP;
Masanori Araki, Odawara, JP;
Masatoshi Baba, Odawara, JP;
Yuji Sueoka, Odawara, JP;
Isamu Kurokawa, Odawara, JP;
Hisaharu Takeuchi, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
For using a plurality of files contained in one logical device with a plurality of processing systems, sharing of a data storage unit among the plurality of processing systems is realized without need for a host processing system to check use states of the files in a server storage unit. Information concerning extent (extent range) of an input/output processing request issued by a host processor is stored in a control memory incorporated in a control unit for allowing the control unit to make decision as to overlap of the extents of the input/output processings to thereby effectuate exclusive control on an extent-by-extent basis.