In: Volume 2834 of Lecture Notes in Computer Science, pages 557-564. September 2003.
Abstract: When on duty, a server should take charge for everything needed to operate the network information service system, including the switching between service and backup. That is the main idea of tenure duty method (TDM). It is a sharp contrast with the cluster method which has an extra front end load balancer and the domain name resolution method with a dedicated DNS. The idea came from the survivability research, which emphasized the idea of mission critical and sought the goal of recovering the ordinary services rapidly assuming the essential services being secure. So minimize the essential service set is one of the way of trading performance cost for survivability. The implementation of autonomous connection migration and free competition mechanism are the technical support of TDM. The survivability situation of the server is described with the Petri net expression. This is follow by the description of TDM. It featured temporal stochastic tenure and spatial Brown motion model. And finally with the experimental model and the mathematical tool, the paper analyzed the related index showing the survivability of TDM quantitatively.