allows global cross mounts from ~300 compute nodes) There is a variety
of codes we run; some latency sensitive and others bandwidth
sensitive.
if you're sensitive either way, you're going to be unhappy with Gb.
IMO, you'd be best to configure your scheduler to never spread an MPI
job across switches, and then just match the backbone to the aggregate
IO bandwidth your NFS storage can support.
something like 10G uplinks from 48pt switches would probably work well.
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