[jpgvm]

I didn't realise Isilon used BSD (was aware it was IB based) or that IB drivers work well on BSD, that is cool.

That said, the primary platform is Linux and HPC is a very demanding workload. Unless I had a lot of time to invest in BSD kernel development I would stick with Linux.

That is putting aside Lustre too which is usually a non-negotiable requirement for HPC.