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. 24, 2015
Filed:
Nov. 28, 2012
Fujitsu Limited, Kawasaki-shi, JP;
Motohiro Sakai, Yokohama, JP;
Akihito Kobayashi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A virtual storage device including a releasable region decider that decides whether each of a plurality of management unit regions is a releasable region, being allocated a physical region and being a release candidate region, by referring to management data that associates allocation data representing a state of allocating a physical region to the management unit region and release candidate region data representing whether the management unit region is a release candidate region with each other; a determinator that determines whether the management unit region decided to be the releasable region by the releasable region decider is an all-zero region all data in which are zero; and a releaser that releases allocation of a physical region allocated to the management unit region determined to be the all-zero region by the determinator. This configuration makes it possible to efficiently use the storage region.