An Approach To Design Fault Tolerance Technology And Study Load Balance In Real Time Distributed System

The viewpoint of reai time system needs the function of fault olerance has been approved widely by the researchers in the domain of eal time system and fault tolerance.At the same time,the extensive application prospect of distributed management and control,a large amount of developing and using a variety of distributed software and hardware system,and the distributed system's advantages of module,parallelism,and self-government also drive people to spend more energy to study the distributed fault tolerance system. Combining the electric power's SCADA system,the text introduces the correlative concepts of real time,fault tolerance and distributed system,and expounds the distributed process environment on the base of PC and Ethernet.According to the requirement of the real time system fault tolerance mode,designs the distributed PC fault tolerance system. The paper presents an approach to design duplicated fault tolerance technology based on multi—threads Windows operation,and demonstrates the way to realize it in serial port and in network port.The paper discusses the Duplicated former computers and Duplicated servers'achievement details in the computer group system,and presents the overall equity mode based on the network broadcast and duplicated network mode.Also,the text designs some other fault tolerance measures.To realize the time unity of distributed time system,the united time server system or time server must be established.The paper provides an arithmetic of getting the time emendation for practical demand,and uses Socket programming to realize it in electric power systems.The text also discusses some real time dispatch algorithm.According to the requirement of load balance in the design of real time distributed fault tolerance,the text carries out thorough research,submits the system's load balance mode,and discusses the service objects'fault tolerance and load balance,also designs some load balance algorithm.To conclude the redundancy in the adaptive high available-load balancing algorithm,takes genetic algorithm.For some algorithm,the text has some emulations and tests.The load balance guarantees the effective utilization of the redundancy system's resource. The design of Fault tolerance and the study of load balance guarantees the system's high-reliability,high-usability and real time's requirement,and has extensive application prospect.