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. 20, 2014
Filed:
Aug. 26, 2011
Katsuya Sato, Odawara, JP;
Shintaro Inoue, Odawara, JP;
Yutaka Takata, Ninomiya, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention comprises a virtual volume, which is a virtual storage area comprising multiple virtual page groups, a pool, which is a storage area comprising multiple pool page groups having different access performance, and a controller, which comprises a corresponding relationship between the virtual page and the pool page, and accesses the pool page corresponding to the virtual page based on accesses to the virtual page from other apparatuses, and the controller, based on an access load trend with respect to each virtual page in each time slot, executes processing for deciding an ideal pool page allocation destination for each virtual page in each time slot, and reallocating a virtual page to the ideal pool page at a time, which is prior to a start time, so that the ideal pool page can be allocated to each virtual page by the start time of each time slot.