[Lustre-discuss] max write speed of QDR HCA card

Atul Vidwansa Atul.Vidwansa at Sun.COM
Wed Dec 30 22:43:44 PST 2009

Hi Lakshmana,

You can use standard ofed tools like ib_rdma_bw to check Infiniband  
bandwidth between pair of nodes.

Lustre provides lnet selftest tool for measuring IB bandwidth between  
pair or group of nodes. Check lustre manual for how tos.

Finally, can you post IOR parameters you are using?


Sent from my iPhone

On Dec 31, 2009, at 5:13 PM, lakshmana swamy <klakshman03 at hotmail.com>  

>   Dear All,
>   Whats the maximum write speed can be achieved with Infiniband QDR  
> HCA card.
>  The Question arised from my lustre  setup where Iam not able to  
> exceed 500MB/s (write speed) with two OSSs and one MDS
>  Each OSS has four OSTs and one HCA card. I would like to know which  
> is the bottleneck here.
>  I have been using IOR for benchmarking
> Thank you
> LakshmaN
> New Windows 7: Simplify what you do everyday. Find the right PC for  
> you.
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