[Beowulf] Cheap SDR IB

[Pfenniger Daniel]

Mark Hahn wrote:
>>> If I had just 2 fat nodes could I connect the HCAs directly to each 
>>> other and avoid the switch costs? 
>>
>> Yes.  With 3 nodes it might be cheaper having 2 HCA per node, 6 cables,
>> than the switch solution.
> 
> with 3 nodes, each with a two ports,
> wouldn't you need just 3 cables?
> 
Yes, I forgot to divide by 2!
Some HCA have 2 ports, so they would be indicated for a 3 node 
switchless cluster.

Dan