What I wanted to actually do is not what is done in this link https://satishdotpatel.github.io/HPC-on-openstack/ , because here vm's are given the possibility to use the infiniband port through Virtual functions, but in my case, I want to use infiniband for openstack management, compute and storage networks, to get better performance than when using ethernet and rg45 cables. so I'm wondering if it's feasible and whether it's a good thing or not.