[Beowulf] Dual IB Cards in a Single Box

Jörg Saßmannshausen sassy-work at sassy.formativ.net
Fri May 10 10:44:38 PDT 2019

Hi Paul,

if that is a Mellanox network I would have thought that putting in a single, 
dual port HDR InfiniBand card would do the trick as well. From what I 
understand, the HDR will use the slower FDR speed when the other end is only 
I done a similar setup with a mixed network where the switch is FDR but some 
of the nodes are only QDR and here the connection is throttled down to QDR.

I might, of course, be wrong here. 

All the best from a sunny London


Am Freitag, 10. Mai 2019, 12:13:42 BST schrieb Paul Edmon:
> We are looking to bridge our FDR fabric to our HDR fabric via LNET and
> we had a question about whether a single machine can have 2 different IB
> cards simultaneously. Does anyone have any experience with that or know
> if there are any hitches with having a single box with a FDR card and a
> HDR card running simultaneously?
> -Paul Edmon-
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