I have a need to add a Windows 2008 Domain controller to a Windows 2008 R2 Domain controller, the latter being still in Windows 2008 mode (not R2 mode). Would this be a problem?
Here is what I'm trying to do:
I have an upcoming class that's based on Windows 2008. I have two servers on which to host Windows 2008 servers and related applications: a quad-core workstation with plenty of memory and drives, and an old Dell 6-blade server. The former is 64-bit and the latter is 32-bit.
On the 64-bit server, I'm running Windows 2008 Server R2 Datacenter with a Domain controller, DNS, and DHCP running in a virtual instance (ROOT-DC1). I also have Exchange 2010 (EXHANGE-1) and System Center Essentials 2010 (SCE2010) running in their own virtual instances.
In the classroom is the 32-bit blade server, which has six blades within it.
For security reasons, I'd like the ability to remove the 64-bit server when I'm not having class (this unit belongs to me personally, and I'm not the only instructor using the room.) Furthermore, I'm not completely comfortable relying completely on a single point of failure.
What I'm hoping to do is attach the 64-bit server to the network, setup one of the 32-bit Windows 2008 Server blades as a second Domain controller (ROOT-DC2) and have it serve as the Domain controller, DNS, and DHCP when the 64-bit server isn't physically there.
Assuming I installed the forest and Domain in Windows 2008 mode as opposed to Windows 2008 R2 mode, is there anything special I have to do to add a 32-bit Domain controller (ROOT-DC2) to the root Domain?
What might I have to do to have ROOT-DC2 serve as a redundant DNS and DHCP server?
I realize that I will have to attach the 64-bit server to the network regularly to ensure that they don't tombstone or whatever it is occurs when Domain controllers lose contact with one another for extended periods.