Assume I have SAN and two servers running Windows 2008 Server R2 and I want to cluster the two servers. (Note there will be no VM's on these servers - they will be running purely physical.) How many separate networks would I need? I can see that I need one network card in each server for ordinary network communication that are linked through a switch - I will call this the 'LAN' switch. I also need one network card in each server for the heartbeat network joined by either a crossover cable or a switch - I will call this the 'heartbeat' switch. What about the SAN? Do I need a separate network card in each computer for the SAN joined by a switch by analogy with the previous names I will call the 'SAN' switch?
Or do I just add the SAN NIC to the LAN switch?
Or to the heartbeat switch?
If more than one alternative is possible I would appreciate knowing the merits of the different configurations?