FDR InfiniBand ... can you stack interconnects

[chuckk281]

An InfiniBand question from Greg:

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Customer would like to know if they can stack FDR (managed) interconnects between enclosures to provide higher aggregate speed to other enclosures.

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Reply from Andrey:

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You may connect multiply enclosures in single Infiniband fabric with oversubscription up to 1:1 (max bandwidth)

For 2 enclosures you may simply connect FDR switches from first enclosure to another.

For more than 2 enclosures you should use external FDR switches and build “FAT- Tree” network

Like this for 4 enclosures:

See more about IB  at

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00593119/c00593119.pdf

and about Fat-Tree at http://www.mellanox.com/clusterconfig/

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Comments or questions?