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Linux friendly shall be built using commodity hardware with enterprise components. Dell, HP and Supermicro all deliver basic servers without too much hassle.
for more information see: hardware design
Servers are to have at least the following hardware (or better):
See for more information: Server specs
Controllers have at least the following hardware on board:
Compute nodes have at least the following hardware on board:
Storage nodes have at least the following hardware on board: