Good morning,
thank you very much for all those replys.
I really haven't thought that :)
Yes, our network wasn't designed for pNFS at all, because we have never used it.
We have started now to use clients, which are using this by default and we have encountered this problem.
Our storage network was ever only switched, so no routing is/was possible and we always had to choose the right IP range for the client and node.
We also normally don't have huge clusters, so no volume movement either.
But I have really thought, that the pNFS implementation is at least broadcast domain aware, but it seems it isn't. This means, that pNFS is not working in our environment. That's ok for us.
Thanks a lot for the deeper insight you all have given me.
Best regards Florian Schmid