The Research Of Disaster Recovery

As IT system becomes a key component of business process, most stages of the business life cycle are totally dependent on IT services.Some organizations rely more on information systems whose high availability and Security become an urgent need. Disaster recovery system has significance to national defense, administrations, enterprise. The main aim of disaster recovery system is to improve system survivability, to keep business continuity and to reduce lost.A new trend to disaster recovery system is to integrate high availability into IT syetem, IT system requires shorter recovery times and points, and should undertake more risks. The evolution in storage and application architecture and newly advance in network technology has provided enough energy for technology advance in disaster recovery system.Large organizations always have very large and highly complicated IT system, Disaster recovery planning and investment decision becomes hardly to manage. There are some needs for practicable applicatin analysis and design method to recognize potential threat, to make clear the consequences of downtime, to define their recovery times and points objectives, and to determine appropriate availability investments.According to engineering idea, a living cycle model is introduced. Based on this model, a new method for disaster recovery system analysis and design is proposed and researched. Then, some important background technologies are discussed which include storage and application architecture. Their impacts to disaster recovery also are put forward. Later, we study main disaster tolerance technologies including data backup, data replication, data mirror, cluster and load balance. Their disaster recovery features are analyzed and their suitable cases are proposed. At last, we study disaster recovery system design and management. A disaster recovery solution is discussed, which is successfully put into practice in ZHEJIANG TELCOM Accounting Center.