[lustre-discuss] Nodemap, ssk and mutiple fileset from one client

Moreno Diego (ID SIS) diego.moreno at id.ethz.ch
Mon Jan 6 00:41:25 PST 2020

I’m not sure about the SSK limitations but I know for sure that you can have multiple filesets belonging to the same filesystem on a client. As you already said, you’ll basically need to have one LNET per fileset (o2ib0, o2ib1, o2ib2), then mount each fileset with the option ‘-o network=<filesets_lnet>’.

I gave a talk on our setup during last LAD (https://bit.ly/35oaPl7), slide 24 contains a few details on this. It’s for a routed configuration but we also had it working without LNET routers.


From: lustre-discuss <lustre-discuss-bounces at lists.lustre.org> on behalf of Jeremy Filizetti <jeremy.filizetti at gmail.com>
Date: Tuesday, 31 December 2019 at 04:22
To: Hans Henrik Happe <happe at nbi.dk>
Cc: "lustre-discuss at lists.lustre.org" <lustre-discuss at lists.lustre.org>
Subject: Re: [lustre-discuss] Nodemap, ssk and mutiple fileset from one client

It doesn't look like this would be possible due to nodemap or SSK limitations.  As you pointed out, nodemap must associate a NID with a single nodemap.  SSK was intentionally tied to nodemap by design.  It does a lookup on the nodemap of a NID to verify it matches what is found in the server key.  I think even if you used multiple NIDs for a client like o2ib(ib0),o2ib1(ib0) you would still run into issues due to LNet, but I'm not certain on that.


On Mon, Dec 30, 2019 at 9:30 PM Hans Henrik Happe <happe at nbi.dk<mailto:happe at nbi.dk>> wrote:

Is it possible to have one client mount multiple fileset's with
different ssk keys.

Basically, we would just like to hand out a key to clients that should
be allowed to mount a specific fileset (subdir). First, it looks like
the nodemap must contain the client NID for it to be able to mount. The
key is not enough. Secondly, nodemaps are not allowed hold the same
NIDs, so it seems impossible to have multiple ssk protected filesets
mounted from one client, unless multiple NIDs are used?

Example: For nodes A and B and filesets f0 (key0) and f1 (key1).

A: Should be allowed to mount f0 (key0).
B: Should be allowed to mount f0 (key0) and f1 (key1).

Hans Henrik
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