I have a Unity 5 VMO system with AD/Exchange onbox. I need to add failover to this system. I want to keep the message store on the secondary. Ideally I'd like to make the existing server the new secondary and add a new server as the primary but the failover wizard doesn't have this option.
Is there a to add failover in this scenario without rebuilding and restoring?
My current line of thinking is to do this:
Build the new Unity server into the existing Domain and Exchange system on the existing Unity server
Use COBRAS to migrate Call Handlers, schedules, etc...
Use GSM to move subscribers to the new server
Once everything is moved and tested on the new server, run the failover wizard.
My concerns are that the failover wizard will not run if the secondary's UnityDb does not look like a freshly installed system and I'll have to either use configmgr to reset the database or uninstall and reinstall Unity.
Can anyone comment on the validity of this plan? Maybe someone knows of an easier way.