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:
Sep. 04, 2007
Filed:
Mar. 24, 2004
Takahiro Nakano, Yokohama, JP;
Junichi Hara, Yokohama, JP;
Tsuyoshi Aoyama, Yokohama, JP;
Koji Sonoda, Sagamihara, JP;
Yoshiaki Eguchi, Machida, JP;
Takashi Horiuchi, Yokohama, JP;
Takahiro Nakano, Yokohama, JP;
Junichi Hara, Yokohama, JP;
Tsuyoshi Aoyama, Yokohama, JP;
Koji Sonoda, Sagamihara, JP;
Yoshiaki Eguchi, Machida, JP;
Takashi Horiuchi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a storage system with a server apparatus having at least one CPU, a memory, at least one network interface, and at least one storage interface, and, at least one disk connected to the storage interface, the server apparatus has a snapshot management part which maintains and manages snapshot of the disk apparatus, the disk apparatus has an operational volume which performs ordinary read/write and a differential volume which stores differential data of snapshot of the operational volume, the snapshot management part stores data on the operational volume in the differential volume, provides a preceding copy area to store its location information, and when free area on the differential volume becomes insufficient discards the stored location information and uses the preceding copy area as an free area.