Research On Load Balance Technology Of Server Clusters Based On Distribution Measurement And Control System

The load balancing is the key technology of the cluster system of the server. In the Distributed Measurement and Control System (DMCS), Using cluster of the server to replace the individual workstation can comprehensive improve the system's handling capacity, so it has important research value.This text propose a highly dependable and highly steady cluster architecture based on a cooperative way of nodal servers and director, this architecture can fully meet DMCS's different service requirements in soft and hard real-time character.Compared with traditional cluster, the cooperative-type-cluster has carried the sync net packets from all real server's network cards to director and set up a priority queue of sync net packets for DMCS, then it has transmitted them through the cooperation of nodal servers and directoer, it has made that the nodeal server lost efficiency suddenly or automatically joined or broke away from the cluster not influence the whole system's normal running again; Meanwhile, it can avoid reducing handling capacity even appearing phenomenon of"living locking"in high load.This text has analysed load balancing method of existent especially LVS cluster system and recommended the net packet and netfilter's frame structures in the Linux operating system; it has compared the cooperative-type-cluster with tradictional cluster in the net packets'queue ways and with active cluster in the load balancing dispatcher way, which has reflected the superiority of cooperation type cluster; the three major parts of the cooperative-type-cluster have been designed and realized in this text, which includes sync packets'priority service for DMCS,"priority and avoid sudden load unbalance"dispatch way at the cooperation of nodal servers and director and active nodal server which ensure cluster normally running when cluster join or rduce node server; The cooperative-type-cluster's control frame controlled by homepage has been constructed; the mulit-services cluster system has been realized; This text has used the existing server pressure testing tools to test the cooperative-type-cluster and LVS cluster, then has comparaed and analysed the two...