Single Pass Load Balancing with Session Persistence in IPv6 Network скачать в хорошем качестве

Single Pass Load Balancing with Session Persistence in IPv6 Network

In a server farm serving mainstream applications, a load balancer is employed to direct packets of an application session to a server that is available and in healthy state for the purpose of scalability and manageability. The load balancer is always in the path of all packets from the client to the server. The load balancer is also in the path of all packets from the server back to the client, except in the case of using DSR (direct server return) technique. In a network topology where a load balancer is not directly connected to servers (as shown in next slide), a server farm throughput is unnecessarily limited by the deployed load balancer’s I/O capacity. Alternative is to add more LB or scale up load balancer. Both alternatives are expensive. With DSR, the returned packets from a server does not need to go through load balancer, however, every incoming packet from a client still need to go through the load balancer. The mechanism described here will enable better scalability of server farm and reduce cost of increasing throughput from the server farm.