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. 16, 2013
Filed:
Dec. 24, 2009
Daisuke Orikasa, Odawara, JP;
Ken Matsuda, Odawara, JP;
Yutaka Takata, Ninomiya, JP;
Yoshiaki Eguchi, Yokohama, JP;
Ai Satoyama, Sagamihara, JP;
Yoichi Mizuno, Yokohama, JP;
Daisuke Orikasa, Odawara, JP;
Ken Matsuda, Odawara, JP;
Yutaka Takata, Ninomiya, JP;
Yoshiaki Eguchi, Yokohama, JP;
Ai Satoyama, Sagamihara, JP;
Yoichi Mizuno, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
If an I/O load on a first virtual storage area falls below a first threshold, a controller copies data in a first storage area, which is allocated to the first virtual storage area, to a third storage area in a second tier storage area, and allocates the third storage area instead of the first storage area to the first virtual storage area. If an I/O load on a second virtual storage area exceeds a second threshold which is greater than said first threshold, the controller copies data in a second storage area, which is allocated to the second virtual storage area, to a fourth storage area in a first tier storage area, and allocates the fourth storage area instead of the second storage area to the second virtual storage area.