[Beowulf] mixing of Infiniband HCAs in cluster

Mikhail Kuzminsky kus at free.net
Wed May 24 05:28:58 PDT 2006

We have a pair of IB 4x (Mellanox MTLP23108) HCAs used currently for 
direct switchless connection of pair of nodes.

Now we plan to buy 8-port (MTK37900) or 24-port IB switch w/HCAs, 
which may be also DDR IB. And we want to build this cluster including 
also old pair of nodes w/MTLP23108 HCAs. But is this possible - to 
have both HCA kinds (DDR and usual IB 4x HCAs) connected to the same 
switch ? If the answer is "yes", is it necessary to setup all the 
DDR-HCA drivers manually for work w/"4x speed" or all the necessary 
things will be done via negotiations ?

Mikhail Kuzminsky
Computer Assistance to Chemical Research Center,
Zelinsky Institute of Organic Chemistry

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