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

Brian J. Murrell Brian.Murrell at Sun.COM
Tue Mar 31 07:20:34 PDT 2009


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.

b.

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