U're not looking at clustering!
All you are looking for is resiliance - you don't want anything to break or lose your data.
rather than describing what you think you need, what is the end result you are looking for?
Are you using two servers to do this or just one?
What sort of load are you looking to get?
What sort of spec are the servers?
What's wrong with what you have at the moment?
Are you looking to back all this up or are you using RAID to do this?
So many questions, so little answers!
F0ul Oli