[Lustre-discuss] LNET o2ib networking and MTU

Isaac Huang isaac_huang at xyratex.com
Thu Jul 14 22:21:22 PDT 2011

On Thu, Jul 14, 2011 at 12:43:32PM -0700, Adesanya, Adeyemi wrote:
> Just need some clarification on this: 
> We use the o2ib driver for Lustre IB communication. We also use IPoIB to define IP addresses for the IB interfaces in the network. Does the MTU configuration parameter impact Lustre in any way? My understanding is that LNET is only using IPoIB for address resolution when using o2ib.

IPoIB MTU settings don't affect Lustre/LNet in any way if the o2ib
driver is used. With recent Lustre releases, you can find out path
MTU of each IB connection used by LNet with:
lctl conn_list --net o2ib0, for example.

- Isaac
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