Upgrading Server from 5.011 to D6 (Not Admin Svr)

I am wanting to upgrade my LEI Server to Domino 6. This is not my primary admin server, it is a secondary server in my domino domain. Is it ok to upgrade this secondary server to domino 6 before upgrading my primary admin server to D6 first.

Has anyone experienced this situation, is it ok, any pitfalls.

Thanks in advance