RMI help

Hi Everyone,
I am totally new to RMI . What i need to do is to build 2 replica servers . These servers will contain information regarding music files which can be updated and viewed by the clients. The servers should be able to handle multiple clients at the same time.

My problem is that i don't know how to create replica servers and how they can be kept up to date regarding changes made by the clients.

Can someone help..?? any kind of information will be greatly appreciated..

Thanks