[lustre-discuss] need info regarding TCP ports for lustre

[Andreas Dilger]

The connection from the client is to the LNet router itself on port 988, and the LNet router establishes its own connection to the target (or next router), assuming the network is also TCP.  There is no "pass through" of the LNet-level connection, it is always point-to-point on the same fabric/subnet. 

The Lustre-level MDS_CONNECT and OST_CONNECT are at a higher level and use "portal" numbers, which are totally different. 

Cheers, Andreas

> On Jun 13, 2022, at 23:27, Åke Sandgren <ake.sandgren at hpc2n.umu.se> wrote:
> 
> 
> 
>> On 6/14/22 00:51, Andreas Dilger via lustre-discuss wrote:
>> *Most* of the port 988 connections will be client->server, but occasionally if there is a network problem and the client connection is dropped, then server->client connections may be initiated to cancel a lock or similar.  If this server->client connection cannot be established, then the client may be evicted.
> 
> How does that part work with LNet routers inbetween client and server? Which IP will it try to talk to?
> 
> -- 
> Ake Sandgren, HPC2N, Umea University, S-90187 Umea, Sweden
> Internet: ake at hpc2n.umu.se  Mobile: +46 70 7716134  Fax: +46 90-580 14
> WWW: http://www.hpc2n.umu.se
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