Sensitivity analysis in optimal design for distributed file allocation systems

In distributed network systems, it is one of the most important problems ho w to assign the files to servers in view of cost and delay. Ii is obvious t hat there is a trading-off relationship between costs and delays in these s ystems. In order to evaluate the optimization that the total cost is minimi zed subject to the total delay, we have presented the Optimal File Allocati on Model as 0-1 integer programming, and have investigated the general char acteristics in distributed systems. In this model, we have introduced many cost and delay parameters to evaluate the total cost and delay in the syste m more exactly. In constructing practical systems, it is necessary to inves tigate the weight and the contribution of each parameter to the total cost. It is very useful to show how to estimate cost and delay parameters on the basis of this analysis. In this paper, we analyze tile sensitivity of thes e parameters and make clear the influence between principal parameters.