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. 26, 2016
Filed:
Aug. 05, 2014
Hitachi, Ltd., Tokyo, JP;
Tsuyoshi Inoue, Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
A first storage apparatus, on the basis of management information representing data existing in a virtual cache area, when a first data conforming to a read request exists in the virtual cache area, determines whether the first data is stored in a first cache area of the first storage apparatus. The first storage apparatus, when the first data is not stored in the first cache area, acquires the first data from a second cache area of a second storage apparatus, and transmits the first data to a host computer. The first storage apparatus, when the first data is associated with the first cache area on the basis of a degree of importance, notifies the second storage apparatus to that effect, and change an apparatus in charge of a cache of the first data of the management information from the second storage apparatus to the first storage apparatus. The first storage apparatus, when the first data is associated with the second cache area, notifies the second storage apparatus to that effect, and deletes the first data.