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:
Mar. 16, 2010
Filed:
Mar. 16, 2007
Scott David Lashley, Portland, OR (US);
Karl Ostner, Wolfgang, DE;
Clarence Madison Pruet, Iii, Flower Mound, TX (US);
Jinming Xiao, Overland Park, KS (US);
Scott David Lashley, Portland, OR (US);
Karl Ostner, Wolfgang, DE;
Clarence Madison Pruet, III, Flower Mound, TX (US);
Jinming Xiao, Overland Park, KS (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Embodiments of the invention generally relate to data processing systems and more particularly to high availability data processing systems. A primary server may share a storage device with one or more clone systems. Each clone generally replicates the state of the primary server, but relies on the same disk-based storage as the primary server. Thus, the clone systems may provide a shadow of the primary server, ready to take over should the primary server fail. The clone systems may access a log file that includes entries reflecting the actions performed by the primary system. The primary server may flush entries from a log buffer maintained on the primary server to a log file stored on the shared disk-based storage. The primary server may also send a log sequence number to the clone systems, and the clone systems periodically transmit a log sequence number back to the primary server indicating how far through the log file a clone system has progressed.