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:
May. 01, 2012
Filed:
Dec. 09, 2010
Yoshiaki Eguchi, Yokohama, JP;
Yasutomo Yamamoto, Sagamihara, JP;
Hiroshi Arakawa, Sagamihara, JP;
Yusuke Hirakawa, Odawara, JP;
Yoshiaki Eguchi, Yokohama, JP;
Yasutomo Yamamoto, Sagamihara, JP;
Hiroshi Arakawa, Sagamihara, JP;
Yusuke Hirakawa, Odawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The data up to a point of time whereat failure has occurred will be restored at high speed at a remote site without imposing any burden on a host. The first storage system on the master side processes an I/O request from the host, and as a result of I/O processing to the second storage system on the remote side, transmits the update data. The second storage system retains data received from the first storage system as update log data. The host transmits a command for settling a state of an application to the first storage system as data, and the first storage system transmits the data to the second storage system. The host and the second storage system both retain an identifier corresponding to the command, and relate the identifier to the log data. Thereby, the host designates the identifier at any given time, whereby the second storage system restores the data at any given time.