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. 15, 2009
Filed:
Jan. 12, 2006
Akira Matsui, Yokohama, JP;
Hiroshi Suzuki, Yokohama, JP;
Akira Matsui, Yokohama, JP;
Hiroshi Suzuki, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Data is updated while making sure that one logically meaningful data group is set as the unit of data update. A host computer requests a first disk controller a data input/output request to/from a logical volume of a first disk drive. When the request is an update request, requested update data is stored in the first logical volume, by a first control. The update request is sent to a second disk controller and is temporarily accumulated there, when information indicating a group to which the update data belongs is attached to the update request. When the first disk controller finishes executing every data input/output request that is designated by information indicating to which group the update data belongs, the accumulated update data for those belonging to the same group to which group update data belongs is retrieved and stored in a second logical volume.