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. 04, 2010
Filed:
Jul. 13, 2008
Yohsuke Ozawa, Kanagawa-san, JP;
Ryoh Neyama, Kanagawa-ken, JP;
Hisashi Miyashita, Tokyo, JP;
Mikio Takeuchi, Kanagawa-ken, JP;
Gaku Yamamoto, Tokyo, JP;
Yohsuke Ozawa, Kanagawa-san, JP;
Ryoh Neyama, Kanagawa-ken, JP;
Hisashi Miyashita, Tokyo, JP;
Mikio Takeuchi, Kanagawa-ken, JP;
Gaku Yamamoto, Tokyo, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A primary server transmits a write transaction to N backup devices. Each backup device records the write transaction to a local redo log stored at a high-performance storage and then transmits a notification to the primary device. When the primary device receives notifications from M of the N backup devices, it commits the write transaction, recording it to a low-performance storage. Once the write transaction has been recorded to the low-performance storage, the primary device requests that the backup devices delete their logs. If the primary device incurs a fault, one of the backup devices becomes the new primary device and determines which backup device has the newest local redo log. The backup device having the newest log sends it to the other backup devices, which update their local redo logs to the same state as the newest log. Thereafter, the new primary device is ready to resume transaction processing.