RE: Dell OME server discovery issue
We had the same problem. In the end we had a list of servers we extracted from another monitoring system and imported this into OME. When I am building servers I manually add them as I go along. I'm building roughly 2-3 servers a week so it's not been an issue. Doing it this way assures me that I'm capturing the servers as I go along.
If you need more info on how I did the import let me know and I'll give some more information.