[lustre-discuss] [External] : Re: Lustre Client pinned to use specific NIC on host

[Alastair Basden]

Hi,

I think this is probably what you're after, though I could be wrong:
https://wiki.lustre.org/LNet_Router_Config_Guide#ARP_flux_issue_for_MR_node

Cheers,
Alastair.

On Fri, 3 Oct 2025, Sonia Sharma via lustre-discuss wrote:

> [EXTERNAL EMAIL]
> Thanks, Tim for a quick response.
> I should have mentioned the specific scenario - In this case, lustre client is co-located with an MDS lustre server and the rest of the nice on the host are specifically for MDTs.
>
> I believe the lustre.conf approach wouldn’t work in that case, or there is still a way ?
>
> Best
> Sonia
>
>
> Confidential – Oracle Internal
>
> From: Tim Schnedler <timothyschnedler at gmail.com>
> Date: Friday, October 3, 2025 at 11:54 AM
> To: Sonia Sharma <sonia.sh.sharma at oracle.com>
> Cc: lustre-discuss <lustre-discuss at lists.lustre.org>
> Subject: [External] : Re: [lustre-discuss] Lustre Client pinned to use specific NIC on host
>
> One way to do this is to make a lustre conf file in etc/ modprobe.d
>
> On Fri, Oct 3, 2025 at 12:48 PM Sonia Sharma via lustre-discuss <lustre-discuss at lists.lustre.org<mailto:lustre-discuss at lists.lustre.org>> wrote:
> Hello Dear Lustre Community
>
> I was wondering if there is some setting/way to make a Lustre Client use only a specific NIC to route its LNet messages from even when multiple NICs on that host are configured with the same LNet network.
>
> For example, let’s say I have a host with this below LNet configuration, then is there a way that I can have the Lustre client to use only “10.30.201.26 at tcp” for all its communication
>
> [node1]# lnetctl net show
> net:
>    - net type: lo
>      local NI(s):
>        - nid: 0 at lo
>          status: up
>    - net type: tcp
>      local NI(s):
>        - nid: 10.30.201.26 at tcp
>          status: up
>          interfaces:
>              0: enp1s0
>        - nid: 10.30.201.10 at tcp
>          status: up
>          interfaces:
>              0: enp1s0:10269
>        - nid: 10.30.202.241 at tcp
>          status: up
>          interfaces:
>              0: enp1s0:10257
>
> Best regards
> Sonia
>
>
> Confidential – Oracle Internal
>
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