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. 20, 2007
Filed:
Jun. 15, 2004
Nobuyuki Saika, Yokosuka, JP;
Takashi Horiuchi, Yokohama, JP;
Nobuyuki Saika, Yokosuka, JP;
Takashi Horiuchi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A primary volume groupincludes a primary volumeand a differential volume. A secondary volume groupincludes a primary volumeand a differential volume. Multiple generations of differential snapshots Dto Dare accumulated in the differential volume. When a new snapshot obtaining request is issued while a usage rate has reached a given value, the volume groupsandare synchronized with the volume snapshot (a), and then split (b). After being split, the differential volumeis initialized, and the secondary volume groupis backed up (c). Accordingly, a new differential snapshot can be created and held in the differential volume