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:
Mar. 02, 2010
Filed:
Jul. 03, 2007
Katsuhiro Okumoto, Odawara, JP;
Yoshihito Nakagawa, Ooi, JP;
Hisao Honma, Odawara, JP;
Keishi Tamura, Odawara, JP;
Katsuhiro Okumoto, Odawara, JP;
Yoshihito Nakagawa, Ooi, JP;
Hisao Honma, Odawara, JP;
Keishi Tamura, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A virtualization system, including: at least one first port coupled to at least one host system; at least one second port coupled to a plurality of storage systems; wherein the virtualization system is capable to control to perform processes of splitting a relationship between the first virtual volume and the second virtual volume; storing first differential information identifying data of a first write request; write data of first write request to a storage area of the disk drives related to the first logical volume; storing second differential information identifying data of a second write request, the data of the second request being written after the splitting step, receiving a differential copying request; to copy differential data from the first virtual volume to the second virtual volume, or to copy differential data from the second virtual volume to the first virtual volume.