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:
Dec. 11, 2012
Filed:
Oct. 21, 2008
Akira Ito, Yokohama, JP;
Etsutaro Akagawa, Kawasaki, JP;
Atsushi Sutoh, Yokohama, JP;
Masanori Takata, Yokohama, JP;
Akira Ito, Yokohama, JP;
Etsutaro Akagawa, Kawasaki, JP;
Atsushi Sutoh, Yokohama, JP;
Masanori Takata, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In acquiring a snapshot, when data in a P-VOL is updated, it is determined whether the same data as target data to be stored in a certain second storage area specified by a certain second address of a D-VOL is already stored in a different second storage area specified by a different second address of the D-VOL, the target data being the differential data generated by the update. When the same data as the target data is stored, the target data is not newly stored in the D-VOL, and the different second address, specifying the different second storage area where the same data is stored, is registered in a snapshot management table (CoW table), in association with a certain first address specifying a certain first storage area where the data from which the target data has been generated is stored.