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:
Dec. 23, 2014
Filed:
Feb. 02, 2011
Tomoyuki Kato, Odawara, JP;
Masami Maeda, Odawara, JP;
Yutaka Takata, Ninomiya, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Provided are a storage apparatus and data management method with which the usage ratio of each of the storage tiers is determined beforehand for each virtual volume and data can be managed by being migrated between storage tiers within a range of predetermined usage ratios. A storage apparatus, comprising storage devicesof a plurality of types of varying performance; and a controllerwhich manages each of storage areas provided by the storage devicesof a plurality of types by means of storage tiers ST of a plurality of different types respectively, and which assigns the storage areas in page units to virtual volumes VVOL from any storage tier among the storage tiers ST of a plurality of types, the controllermanaging usage ratios of the storage tiers ST of a plurality of types and assigning the storage areas in page units to the virtual volumes VVOL based on the usage ratio managed.