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:
Jul. 17, 2007
Filed:
Aug. 04, 2004
Toshio Nakano, Tokyo, JP;
Katsunori Nakamura, Tokyo, JP;
Mikito Ogata, Tokyo, JP;
Yoshinori Okami, Tokyo, JP;
Seiichi Higaki, Tokyo, JP;
Hiroshi Abei, Tokyo, JP;
Shigeru Kishiro, Tokyo, JP;
Akira Yamamoto, Tokyo, JP;
Toshio Nakano, Tokyo, JP;
Katsunori Nakamura, Tokyo, JP;
Mikito Ogata, Tokyo, JP;
Yoshinori Okami, Tokyo, JP;
Seiichi Higaki, Tokyo, JP;
Hiroshi Abei, Tokyo, JP;
Shigeru Kishiro, Tokyo, JP;
Akira Yamamoto, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Two data centers located in the vicinity are connected using a synchronous transfer copy function, and one of the data centers is coupled with a third data center disposed at a remote location by an asynchronous remote copying function. The order whereat a storage sub-system located in the vicinity has received data from a host is consistently guaranteed, and the third data center holds the data. Further, each storage sub-system includes a function whereby, during normal operation, data can be exchanged and the data update state can be obtained by the storage sub-systems located in the two data centers that do not directly engage in data transmission.