Weighted Response Time Algorithm for Web Server Load Balancing in Software Defined Network

Large number of internet accesses in recent years has caused some network services to require a load balancing scheme. Software-Defined Network (SDN) offers a solution for load balancing on a traditional network that requires a lot of costs. One of the load balancing algorithms on SDN discussed in previous research is the server's response time-based algorithm, but this algorithm does not count the specifications of the server. Meanwhile, in the real implementation of internet services, it is possible if the servers used have different specifications. Therefore, in this study, a weighted response time algorithm is proposed. This algorithm divides the server load based on the ratio of response time and weight values that represent server specifications. In the weighted response time algorithm, client requests are directed to the server with the lowest ratio of weight and response time values. The results of this study showed that a network that implemented a weighted response time algorithm requires less response time and produces better throughput than a network with the previous algorithm, namely response time-based algorithms. Based on testing, a network with a weighted response time algorithm requires the lowest response time of 2.17 ms and resulting highest throughput of 100.70 KB/s.