I know this website 1channel.ch which has like 4 servers in 4 different datacenters across the globe (czech republic, estonia, sweden, germany). What happens is as i am browsing this website the server changes meaning he is balancing the server load in realtime among the datacenters.
How is he doing this? What softwares or applications are needed to achieve this?
Any expert advice as to the best practices in achieving this will be ethernally appreciated.