So I have a fresh install of OMV 5 (updated from 4 hoping to solve this issue). I have 5 NICS (one on board, 4 on a card). I am trying to bond them, but when I choose 802.3ad I cannot choose a primary NIC. This causes the system to freak out until I revert the bond, which I have to do because there is no other way for me to apply the settings (it just hangs while applying). I have had this set up in the past successfully, and maybe I am just misremembering how to do this, but I was hoping someone here could give me a little bit of guidance.