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:
Oct. 08, 2013
Filed:
Jun. 15, 2005
Yoshio Suzuki, Kokubunji, JP;
Nobuo Kawamura, Atsugi, JP;
Kota Yamaguchi, Yamato, JP;
Shinji Fujiwara, Sagamihara, JP;
Satoru Watanabe, Kokubunji, JP;
Yoshio Suzuki, Kokubunji, JP;
Nobuo Kawamura, Atsugi, JP;
Kota Yamaguchi, Yamato, JP;
Shinji Fujiwara, Sagamihara, JP;
Satoru Watanabe, Kokubunji, JP;
Hitachi Ltd., Tokyo, JP;
Abstract
A disaster recovery technology capable of achieving the high-speed FO and correctly reading the logs even if the unit of logs written in the main site is large is provided. In the disaster recovery system comprising a main site and a sub-site, when the writing in units of a log block consisting of a plurality of log records is performed in the main site and the logs are applied in the sub-site, the log blocks are read from the sub-storage to verify the consistency, and it is determined whether the reading process conflicts with the writing process through the remote copy operation when reading the logs. Then, only the log blocks in which the reading process does not conflict with the writing process as a result of the determination are applied to the database. Thereby, the logs are applied in the sub-site independently to recover the database.