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. 03, 2016
Filed:
Jul. 02, 2013
Hitachi, Ltd., Tokyo, JP;
Tsuyoshi Inoue, Tokyo, JP;
Katsumi Hirezaki, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a storage system, a real page is allocated from a pool to a write destination virtual page in a virtual volume. The real page includes multiple real regions. The storage system moves all valid data stored in two or more move-source real pages respectively allocated to two or more virtual pages, to move-destination real pages the number of which is less than the number of move-source real pages in units of real regions. Each piece of valid data can be used by any one of the access sources. The storage system writes the predetermined data to all move-source real regions in each of move-source real pages, so that each of the move-source real pages is set as a recovery target real page which is a real page storing only the predetermined data, and performs real capacity recovery for making each recovery target real page into an unallocated state.