[Lustre-discuss] How to force client-oss communication over IB when the MDS has only ethernet?

[Tero Hakala]

>> At the moment, it seems that all the traffic between clients-OSS goes 
>> also through the slow eth connection.  Is it possible to force them to 
>> use faster IB interfaces when communication with each other, and only 

> Stupid question time: is it possible that you added the IB interface to
> the OSSes _after_ you created the filesystems on the OSSes?
> (I know that the MDS remembers the interfaces that are on it at MDS
> creation time, and you have to do an extra step to tell it about any
> new interfaces; I think the same is true of the OSSes, but I am not
> 100% sure).


Yes! I created OSTs and did some testing with plain eth configuration 
first, so this would explain things.  How can I tell the MDS that things 
have changed?

  -Tero