Clustering

hi! we're on rh7.3, we have dns, email, proxy, internet servers on running
on different boxes (clones).

im looking at putting all this boxes in one cluster with load balancing
support.

1. is it possible to create a cluster with these clones?

2. what additional hardware (adapters, etc) do i need?

3. how well does rh7.3 support cluster with load balancing? do i need to
upgrade?

4. additional software i need?

5. what advantages/disadvantageswill i gain from clustering my internet
servers?

6. other considerations?


thank you very much!!


joey