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How to change speed from FDR to QDR using ibportstate command in centos 6.2

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We have Mellanox Infiniband FDR cards and cables supporting it. We want to reduce the speed of the adapters from 56 Gbps to 40 Gbps. We tried using ibportstate <base lid> <port id> of the node. However, it does not help. Please let me know the exact sequence of commands to do so.

 

Card :

Mellanox Tech. MT27500 Family [ConnectX-3]

 

Switch : Mellanox 6536 Switch


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