随着信息系统在关键应用中的普及，信息系统的容灾能力日益成为人们关注的焦点。失效检测技术是构建容灾系统的关键技术之一，快速、高效、准确的失效检测是实现有效容灾的前提与保障。本文研究了一种基于环拓扑的失效检测算法FDADRBR，该算法改进了环拓扑面向容灾需求的不足，克服了树形拓扑的单点失效问题，比树形拓扑的网络开销小。实验表明，该算法具有较低的诊断延迟和较好的可扩展性，可有效增强容灾系统失效检测的可扩展性，能够应用到容灾的监控管理系统中。

With the rapid development of information systems in critical applications,their disaster recovery capability becomes a focus point.Failure detection algorithm is one of the crucial techniques in building a disaster recovery system.Fast,efficient and accurate failure detection is the precondition and guarantee for the realization of the disaster recovery effectively.This  paper studies a FDADRBR failure detection algorithm based on ring topology.Our FDADRBR algorithm remedies the deficiencies of ring topology when applied to disaster recovery,and resolves the single failure of the tree topology with less overhead.The experimental results indicate that this algorithm not only has higher accuracy,less network overhead and lower diagnosis latency,but also effectively enhances the failure detection algorithm’s expandability in disaster recovery,and can be used to manage the information systems of disaster tolerance.