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:
Jul. 02, 2013
Filed:
Feb. 08, 2011
Norimitsu Hayakawa, Inagi, JP;
Takao Totsuka, Hadano, JP;
Norimitsu Hayakawa, Inagi, JP;
Takao Totsuka, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A hypervisor sets all physical areas in an allocation area, which is allocated to a virtual machine from within a physical memory and is configured from a plurality of physical areas, to a write protect mode. In a case where a physical processor identifies that the write-destination area from the virtual machine is in the write protect mode, the hypervisor manages the write-destination area as an updated area, and cancels the write protect mode of the write-destination area. At a certain point in time, the hypervisor copies data inside the updated physical area from within the allocation area to a storage area (a copy area) that differs from the allocation area. In a case where a prescribed failure is detected in the physical area, the hypervisor restores data from the copy area.