Because the Web server with the increased volume of business, the rapid growth of traffic and data traffic, its processing capacity and computing strength also increased, so that a single server cannot bear. In this case, throw out the existing equipment to do a lot of hardware upgrade, it will cause the waste of resources, but if we face the volume of business the next upgrade, which will cause the high cost to upgrade again hardware investment, even the performance and excellent facilities can not meet the current business demand growth. Therefore, the load balancer is necessary, or say, WAF supports load balancing will be a necessary function.
