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Which infiniband for CFD in 2022? [used]

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Old   February 9, 2022, 17:18
Default Which infiniband for CFD in 2022? [used]
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Hey,


I am on the hunt for the best bang for the buck infiniband for a small cluster (<10 nodes) running Fluent and OpenFOAM mostly. Is Mellanox the go-to, what switch should I get, how about cables, and most importantly perhaps - which model/speed?



Also, if you have any suggestions of a good store that sells these refurbished parts within the EU that would be awesome.
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Old   February 15, 2022, 13:46
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I'm no expert, others will have better info than I.
But you will pay an outrageous amount for brand new Infiniband, and you do not need those speeds for a 10 node cluster.
I get old used QDR or FDR stuff off ebay for cheap. Depends on your budget, FDR is faster.
Yes, Mellanox is pretty much the Standard.
I would go with ConnectX-3 or Higher.
Just get the cables with the correct bandwidth rating and end connectors, usually QSFP or QSFP+, but those two are sort of used interchangeably (incorrectly), which is kind of confusing.
Like I said, I'm no expert, others will have better info.
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Old   March 12, 2022, 16:44
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If you get dual port ConnectX-3 cards, you can build your network without a mellanox switch. (I have a switch, but dont like to use it because it has a jet engine in the back.) opensm is really very good at routing traffic.
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