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. 16, 2010
Filed:
Oct. 27, 2006
Atsushi Ebata, Yokohama, JP;
Shinichi Kawamoto, Hachioji, JP;
Jun Okitsu, Kokubunji, JP;
Yoshiko Yasuda, Tokorozawa, JP;
Atsushi Ebata, Yokohama, JP;
Shinichi Kawamoto, Hachioji, JP;
Jun Okitsu, Kokubunji, JP;
Yoshiko Yasuda, Tokorozawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method for moving files between network storages in a virtualized network storage system having multiple network storages and rebalancing the free disk spaces. It periodically judges whether to start rebalancing. Two different conditions are adopted for the determination of start: (a) an imbalance of free disk spaces and the minimum value of the free disk spaces is less than a threshold and (b) an imbalance of free disk spaces and the frequency of accesses to the system is less than a threshold. Rebalancing is performed until the difference in free disk spaces falls below the threshold without exceeding the maximum execution time of rebalancing. If a request to write into a file which is being moved from a client takes place during a file moving step, the movement of the file is aborted and the file is deleted from the destination.