Thanks. That example is simpler than I imagined. Question: If that was indeed your situation and you could afford it, why not just go totally with infiniband switching/routing? Are not the routers just a hack to connect Intel OPA to IB? Ref: https://community.mellanox.com/docs/DOC-2384#jive_content_id_Network_Topology_Design -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20160920/4bca7ab9/attachment.html>