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:
Aug. 27, 2013
Filed:
Aug. 07, 2012
Yoshinori Ohira, Yokohama, JP;
Shoji Kodama, Sagamihara, JP;
Kenta Shiga, Yokohama, JP;
Yoshiaki Eguchi, Yokohama, JP;
Yoshinori Ohira, Yokohama, JP;
Shoji Kodama, Sagamihara, JP;
Kenta Shiga, Yokohama, JP;
Yoshiaki Eguchi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is provided a storage subsystem having a virtual volume and a page volume which has a page physical area allocated to the virtual volume. The storage subsystem divides an address space of the virtual volume into a plurality of pages, classifies each of the pages into one of a plurality of states including at least a first state and a second state, and further divide a page which is classified into the second state into a plurality of segments to managed the page classified into the second state. The first state is a state in which a page physical area is allocated to the page from the page volume, and the write data is stored in the page physical area. The second state is a state in which the predetermined pattern data and the segment are managed, in the memory, by correlating with each other.