[lustre-discuss] lctl ping issue on 2.7.19

[Dilger, Andreas]

I'm no LNet expert, but I do know your o2iblnd module settings need to match on client and server (see /etc/modprobe.d/). 

There is work being done to make this more flexible, but it's not finished yet. 

Cheers, Andreas

> On Nov 11, 2017, at 08:37, john casu <john at chiraldynamics.com> wrote:
> 
> Have a bizarre issue, where I can lctl ping between clients and lctl ping between servers
> but cannot ping between a client and a server.
> 
> on my server, I see the following error that seems to explain the issue:
> Nov 10 09:19:01 mds1 kernel: LNet: 328:0:(o2iblnd_cb.c:2343:kiblnd_passive_connect()) Can't accept conn from 10.55.10.11 at o2ib (version 12): max_frags 256 too large (32 wanted)
> 
> Does anyone have any advice on how to simply resolve this?
> 
> I'm running 3.10.0-514.10.2.el7_lustre.x86_64 on the server (centos 7.2 base) and
> 3.10.0-514.10.2.el7_lustre.x86_64 on the client (centos 7.3 base)
> also using built in IB drivers.
> 
> thanks,
> -john c.
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