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:
Feb. 04, 2014
Filed:
May. 30, 2008
Akira Deguchi, Yokohama, JP;
Noboru Morishita, Yokohama, JP;
Ai Satoyama, Sagamihara, JP;
Hisaharu Takeuchi, Odawara, JP;
Akira Deguchi, Yokohama, JP;
Noboru Morishita, Yokohama, JP;
Ai Satoyama, Sagamihara, JP;
Hisaharu Takeuchi, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A plurality of modules () and () comprise a plurality of virtual volumes with which the same volume identification number is associated. A module (), which receives a write request from a computer, searches for an unallocated real area from among a plurality of real areas in the module () rather than from among a plurality of real areas in the other module () if a real area has not been allocated to a write-targeted virtual area in accordance with the write request. The module () allocates the real area retrieved from the module () to the write-targeted virtual area, and writes data according to the write request to this real area.