Ok, now that I have received all the network gear I needed I can continue with this adventure :-)
Here is the conceptual design.
I know that Hadoop runs tipically on local storage but I will try also MPICH2 and may be Rocks cluster, both of them using SAN storage.
- I had problems with the HW of one node (Overclocking is no longer supported to provide max stability :-) so I had to fix it reducing its speed and finished adding one master node with plenty of power (P-IV 3Ghz) and heat :-(.
- I have installed the net switch plus one manageable power plug array so I can start any node remotely. I have seen more than 400Watts when they are running :-((((( so it is mandatory to be able to switch them on and off on demand.
And this is the physical layout (not very detailed but gives one idea of the real stuff).