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:
May. 11, 2010
Filed:
Jul. 23, 2007
Takuma Ushijima, Atsugi, JP;
Masato Kumagai, Hadano, JP;
Eiichi Sato, Hiratsuka, JP;
Toshio Komaki, Odawara, JP;
Takuma Ushijima, Atsugi, JP;
Masato Kumagai, Hadano, JP;
Eiichi Sato, Hiratsuka, JP;
Toshio Komaki, Odawara, JP;
Hitachi, Ltd., Chiyoda-Ku, Tokyo, JP;
Abstract
A storage system includes a primary volume and a first controller that stores data in a primary volume and stores content at a prescribed point in time in the form of differential data. The first controller generates generational management information corresponding to the differential data of the prescribed point in time and manages the generational management information. The storage system also includes a secondary volume configured to store backup data and a second controller configured to receive data sent from the first controller, store data to the secondary volume, store the generational management information, receive a request for a certain generation of the generations and provide data of the primary volume corresponding to the requested generation based on the request. The first controller determines to send differential data and the generational management information to the second controller when an amount of differential data reaches a prescribed amount.