[Beowulf] Infiniband modular switches

Jan Heichler jan.heichler at gmx.net
Wed Jun 25 06:58:14 PDT 2008

Hallo Mark,

Mittwoch, 25. Juni 2008, meintest Du:

>>> 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.

MH> I guess I'm confused.  wouldn't a non-blocking fabric with 288 host ports
MH> be one layer of 24x 24pt switches (12 up, 12 down to hosts), with _half_
MH> as many top-level switches (ie, 12 switches with 24 down each)?

That is how it is build normally.

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