I agree on monoculture, the point is it does appear to fail (and the Cisco usNIC offering looked better). There are alternative HPC fabrics in new hardware: OP

I agree on monoculture, the point is it does appear to fail (and the Cisco usNIC offering looked better). There are alternative HPC fabrics in new hardware: OPA (although being canned by Intel), Shasta (Cray), BXI (Bull), and Tofu (Fujitsu), at least, and surely AWS could build their own if they wanted. I don't know whether Oracle still have their own IB, which might be in their cloud if you want to get involved with Oracle. Edit: Fix Cisco fabric name, add OPA.