Each server in a cluster periodically determines its own workload based on the response time of the requests the server has processed recently. The workload is expressed as a number from 0 to 100, where 0 indicates a heavily loaded server and 100 indicates a lightly loaded server. This number is called the server availability index. As response times increase, the server availability index decreases. The server availability index is approximately equal to the percentage of the total server capacity that is still available. For example, if the server availability index is 65, you still have approximately 65% of the capacity of your server available. Although the servers in your enterprise may vary in power and resources, the server availability index represents the same thing on each server -- the amount of total availability of that server that is still available