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:
Oct. 14, 2008
Filed:
Jan. 13, 2006
Atsushi Ebata, Fuchu, JP;
Atsushi Sutoh, Yokohama, JP;
Atsushi Ebata, Fuchu, JP;
Atsushi Sutoh, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided is a technique which solves a problem of a long-time reduction in a service level after service restoration and a problem of a failure caused by a disk capacity shortage during primary volume restoration. According to the technique, reference is made to a differential block management unit () setting which of a differential volume () and a primary volume () a data block of a restoring source snapshot volume (VVOL No.) is to determine which of the primary volume () and the differential volume () a volume storing read data is. When a restoring target data block is in a differential volume (), data of the differential volume () is restored in the primary volume (). Upon accessing to the primary volume () while restoring, switching is made to a virtual primary volume after restoration where data of the primary and differential volumes are combined based on the snapshot volume (VVOL No.) to execute accessing.