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:
Feb. 14, 2012
Filed:
Feb. 04, 2009
Takashi Kaga, Odawara, JP;
Yoshihiro Asaka, Odawara, JP;
Takashi Kaga, Odawara, JP;
Yoshihiro Asaka, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage apparatus provides, in a dynamic provisioning system, a virtual logical device (DP-LDEV) that is a virtual logical device configured of a real logical device (N-LDEV). In the storage apparatus, a storage area of a real logical device is managed by being divided into unit cache areas (SLCBs), which are predetermined management units. A storage area of a virtual logical device is managed by being divided into virtual unit areas (PSCBs), which are predetermined management units. Multiple virtual unit areas having the same data stored therein are made to correspond to the same unit cache area, and thereby data stored in a storage device is managed. The correspondence is established with at the timing of, for example, destaging data from a cache memory.