>>> 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)?
Yes, 2 tiers, 1st with 24X24p and the 2nd with 12x24p _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
