Research And Design Of Failure Detector In Disastor Recovery Storage System Based On WAN

In disaster recovery storage system, in order to ensure the system's high reliability and high availability, extensively use the failure detection technology. Through timely and accurately detecting failures to ensure high reliability.Wide area network have high latency, high jitter and other characteristics, the traditional fault detection is not well adapted to the wide area network based disaster recovery storage systems. Based on the integrated intelligent disaster recovery storage systems architecture, studied the failure detection techniques of disaster recovery storage systems, designed and implemented a wide area network environment based failure detection strategy WSFD, the strategy can well adapt to the wide area network environment, with a short detection time and high detection accuracy. Then, based on WSFD, designed a strategy for application migration. If application server detected storage controller was failed, it would migrate to remote storage controller actively, to ensure system availability and business continuity. The WSFD failure detection strategy and migration strategy were tested, WSFD had better performance of detection time and detection accurency than tranditional heartbeat strategy and the classic adaptive strategy.Base on two sites disaster recovery storage, multi-point disaster recovery storage systems is studied. Analyzed the characteristics and detection methods of large-scale failure detection in multi-point disaster recovery system. As overhead of detections exploded in multi-point system, designed a low overhead failure detection strategy, which can well adapt to multi-point disaster recovery enviroment, reducing the load of node and network generated by failure detection.