Not sure I understand what´s the difference or how it works when servers a running in one cluster or if there are more than one clusters with servers in it - regard High availability & Load Balancing.

For me they are somehow the same, there is not really a big difference. Let´s make a simple example:

1. 2 Servers in 1 Cluster
2. 2 Clusters with each 1 Server

-> 1. If one Server failure, the other one is able to continue the work. The same for Load Balancing, these two Servers are able to balance the work together.

-> 2. The same thing! If one Server failure...

The only thing that could be a problem with point 1. is if the Cluster fails (then both of the Server are dead). But is this even possible? I was reading stuff about clustering and high availability but I think I do not get this really. Probably I did not really understand how a cluster is working. Are these 2 points with 1 Cluster and 2 Clusters somehow the same or are there really some big differences? What should I know about it?

Thank you