[Lustre-discuss] Beginners Question: Mapping Lustre Node <-> DNS Hostname?

[Arne Wiebalck]

On Tue, 2009-03-31 at 10:20 -0400, Brian J. Murrell wrote:
> On Tue, 2009-03-31 at 13:38 +0200, Wolfgang Stief wrote:
> > Hello out there!
> 
> Hi.
> 
> > My setup ist TCP based only. Is there an easy way to match the Lustre
> > node name (testfs-OST0001)
> 
> testfs-OST0001 is not a node.  It's a lustre target.  An OST to be
> specific.  Think disk in a node, rather than a node.
> 
> > with the corresponding IP hostname/domain
> > (something like lussrv1.some.domain)?
> 
> I guess what you really want to know is "what is the IP address (and by
> extension, DNS name) of the machine that is currently providing the
> testfs-OST0001 target?".
> 
> But again, the answer is not so simply an IP address as IP is only one
> of several networking protocols that Lustre works on and as such it
> (LNET) does not use IP addresses as node identifiers but uses NIDs
> instead.  For some protocols, the NID does use the IP address, but this
> is just a convenience of that given protocol.  So really, the only thing
> you can really ask is "what NID is serving the target testfs-OST0001?".
> 
> I'm afraid I don't think there is any easy way to ask this currently,
> other than brute-force searching through the OSSes.
> 
> Maybe somebody else can remember something I'm forgetting.

lustre_createcsv maybe?

Cheers,
 Arne