What is the exact hardware that I need for an OpenSSI cluster?

I think what I need is two PCs, one for the master node and another for
failover, etc. And of course I need a network switch.  

Won't any Linux compatible hardware work with OpenSSI?  The reason I asked
is because I read:

http://www.nabble.com/Installing-OpenSSI-on-a-SATA-hdd-td8120175.html#a8120175
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