[Beowulf] Infiniband modular switches
Ramiro Alba Queipo
raq at cttc.upc.edu
Fri Jun 13 08:28:06 PDT 2008
On Thu, 2008-06-12 at 10:08 -0500, Don Holmgren wrote:
> Ramiro -
> You might want to also consider buying just a single 24-port switch for your 22
> nodes, and then when you expand either replace with a larger switch, or build a
> distributed switch fabric with a number of leaf switches connecting into a
> central spine switch (or switches). By the time you expand to the larger
> cluster, switches based on the announced 36-port Mellanox crossbar silicon will
> be available and perhaps per port prices will have dropped sufficiently to
> justify the purchase delay and the disruption at the time of expansion.
Could you explain me this solution? I did not know about it
> If your applications can tolerate some oversubscription (less than a 1:1 ratio
> of leaf-to-spine uplinks to leaf-to-node connections), a distributed switch
> fabric (leaf and spine) has the advantage of shorter (and cheaper) cables
> between the leaf switches and your nodes, and relatively fewer longer cables
> from the leaves back to the spine, compared with a single central switch.
What do you mean with a distributed switch fabric?
What is the difference with a modular solution?
Thanks for your answer
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