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:
Apr. 29, 2014
Filed:
Apr. 15, 2010
Michio Suetsugu, Odawara, JP;
Hiroshi Abei, Yokohama, JP;
Haruaki Watanabe, Isehara, JP;
Youichi Gotoh, Yokohama, JP;
Michio Suetsugu, Odawara, JP;
Hiroshi Abei, Yokohama, JP;
Haruaki Watanabe, Isehara, JP;
Youichi Gotoh, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A storage apparatus having a plurality of logical volumes includes a storage device, and a storage controller that operates each of the logical volumes as a virtual volume. A primary volume and a secondary volume are configured as a copy pair in which data in the primary volume can be copied to the secondary volume. If the primary volume receives a discard request for a unit physical storage area, the storage controller determines whether or not a unit physical storage area exists configuring the secondary volume corresponding to the unit physical storage area, which is a target of the discard request. If the unit physical storage area configuring the secondary volume exists, an instruction is transmitted to the secondary volume to discard the page or unit physical storage area assigned to the secondary volume.