I setup a 2008 r2 server, promoted it to a DC. I then built a second box, and also made it a DC on the same domain - so effectively I have a PDC and a BDC. I then built a third box, and did the same - so I had three domain controllers for my domain. I had a separate dhcp server - and still do , so its only dns and the actual directory that gets replicated to my knowledge. The 3rd box - I want to VM it - and was going to go through a backup / restore method to get the box virtualized but I am thinking to myself - rather to just format the physical box (the 3rd one) and create a VM - then promote it - but I want the third DC (the VM one) to have the same name as the 3rd physical one I have already formated. I jumped the gun and formated the third box because I knew I had a backup of the 3rd box - getting the restore into the VM is easy enough if I boot from the DVD - then run a recover using the image I created - but I am doing this remotely and I cant insert a DVD - and downloading and mounting the ISO is too much effort now. Although I could do that I am interested in knowing if its possible to simply rename the VM I have created (which is currently a normal member server) rename it to the same name of the now missing 3rd DC, then run DCPROMO, - what will happen - will it error and say I am trying to create a DC that already exists - or does it give me the option to replace the missing one?
Or do I have to remove the missing one from the directory - using some other method - before I can add another one with the same name? I guess because the two main or first two DCs are up and running, I dont really need to do a restore. I also didn't want to use disk to VHD as although I have used that with success before I want to try something different.
More info about what I have done - in trying to get the restore going - I created a VM - then booted it from the network - then I did a network install of 2008 r2. I then rebooted the VM , choose recover - and attempted a restore - which looked promising - it was going to format the drive and all - but as I had copied the windows imagebackup to the local drive of the VM - it would not continue. I guess I would have to create a second drive for the VM - and move the backup files across and try again - and now that I think about it that might work as booting from the DVD should actually give me the same problem as I have the restore files on the local drive.
But anyway - although I may have a work around - I am keen to know what happens when you try to promote a server to a DC in a domain , that already had a DC of the same name - but that DC no longer exists.
Any feedback is greatly appreciated.