We have told you that clustering servers makes servers perform better and increases the availability of our applications. What exactly happens is that when one server in a cluster fails or cannot handle a task properly, other servers come to its rescue, ensuring maximum availability of your network applications.
Clustering is done by binding servers together. And the servers are bounded by a cluster design. One of the limitations of clustering is that not all servers can be clustered. Also, some cluster designs can be extremely expensive. There is another problem with cluster designs. Not all kinds of applications are supported by cluster designs. These are some of the things one should look into before going for cluster servers.
When servers are clustered together, tasks are taken care of by multiple servers. The load is distributed among servers to provide better performance. Now, the mechanism of distributing the load is called load balance, and it is carried by a software program called the load balancer.
When a website received a request for service, the load balancer passes on the request to a server in the cluster, and then returns the processed request back to the client. The load balancer’s work lies in choosing the server to send the request to. It analyzes the load, looks into the availability, and capability of the servers before sending the request. At times, the software simply follows the round robin method to choose a server. Some load balancers also choose the server at random. The load balancer ensures a layer of security between the server and the client.
Keep checking this blog for more discussion on cluster servers.