so the switch fabric would be a 'leaf' layer with 12 up and
12 down, and a top layer with 24 down, right? so 3000 nodes
means 250 leaves and 125 tops, 9000 total ports so 4500 cables.
The number of switch layers, or tiers, depends on the cluster size and
the oversubscription. For full non blocking, 2 layer of 24 switches get
you up to 288 ports switch, and with 36 ports up to 648 ports.
I guess I'm confused. wouldn't a non-blocking fabric with 288 host ports
be one layer of 24x 24pt switches (12 up, 12 down to hosts), with _half_
as many top-level switches (ie, 12 switches with 24 down each)?
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