Research And Discuss On Fault Tolerance Of Internet

Nowadays Internet has becomes the important part of people's life with the development of the network technologies. At the same time, the security of computer network has been paid more and more attention because of its huge loss. Consequently, many researchers and companies begin to develop various technologies which include fault-tolerance, aim to improve security, reliability and availability of network system.This paper studies and analyses the current fault-tolerance, especially introduces its basic theory and application. Aiming at the characteristics of network and the root of failures, the paper applies the technology to network server as to improve security and reliability of network service.After summarized predecessor's achievement, the author puts forward a kind of structure based on isomerism parallel fault-tolerance cluster system(PCFTS), and design its function of every module in view of network server function characteristic. Divides this server cluster system into four different levels: cluster management and control level, web/application servers level, database server level and Data disk array; This paper evaluates the back-end server through quoting the conception of "surplus load-weight", designs a dynamic load-balancing algorithm for heterogeneous web server cluster; This paper joins heterogeneous content-Correlative into the system administration server; Collecting the using information of the user and mining the correlative between data in the data diary on fixed time, then the pattern is distributed into different back-end database servers, According to the data in the contents of users' task request, this paper designs a database server algorithm which based on heterogeneous content-correlative and surplus load-weight; Between the cluster management and control server and all the back-end servers, there are heartbeat-lines which are used for estimating the activities state of the back-end...