SHETHWALA, Zuber,CALLAWAY, Paul J.,REECE, Troy,BAUERSCHMIDT, Paul Andrew,HAGEMANN, III, Robert C,FERRARI, Enrico
申请号：
EP20160166682
公开号：
EP3118743(A1)
申请日:
2007.07.10
申请国别(地区):
欧洲专利局
年份:
2017
代理人:
摘要：
Fault tolerant operation is disclosed for a primary instance, such as a process, thread, application, processor, etc., using an active copy-cat instance, a.k,a. backup instance, that mirrors operations in the primary instance, but only after those operations have successfully completed in the primary instance. Fault tolerant logic monitors inputs and outputs of the primary instance and gates those inputs to the backup instance once a given input has been processed. The outputs of the backup instance are then compared with the outputs of the primary instance to ensure correct operation. The disclosed embodiments further relate to fault tolerant failover mechanism allowing the backup instance to take over for the primary instance in a fault situation wherein the primary and backup instances are loosely coupled, i.e. they need not be aware that they are operating in a fault tolerant environment. As such, the primary instance need not be specifically designed or programmed to interact with the fault tolerant mech
