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:
Aug. 10, 2010
Filed:
Jan. 29, 2007
Yoshiyuki Nishi, Fujisawa, JP;
Nobuhiro Maki, Yokohama, JP;
Kenichi Oyamada, Yokohama, JP;
Kazuhiko Watanabe, Yokohama, JP;
Hiroshi Yamamoto, Yokohama, JP;
Yoshiyuki Nishi, Fujisawa, JP;
Nobuhiro Maki, Yokohama, JP;
Kenichi Oyamada, Yokohama, JP;
Kazuhiko Watanabe, Yokohama, JP;
Hiroshi Yamamoto, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a copy control method, during a process for the acquisition of a data copy at a designated time, a recovery period of time can still be reduced when an input/output request is issued for copy source data at the designated time. For a system that includes a first storage device in which data are stored, a second storage device that obtains a data copy, and a host computer that writes data to the first storage device, the second storage device obtains blank input/output requests that are issued at predetermined time intervals if the host computer does not generate an input/output request for the first storage device, and the second storage device determines that a time closest to a predetermined data copy acquisition time, which is a target time for the acquisition of a data copy, is a copy execution time for the acquisition of a data copy.