Adding another windows 2008 dc for dhcp and dns redundancy

I currently have a windows 2008 domain controller that also serves as a dhcp and dns server.  I'm considering adding another virtual machine 2008 domain controller to serve as a backup.  When I configure new vm, do I just match the total scope and options to match the original domain controller?

Is that the way to go or do I create 2 separate scopes?

i.e. PDC Scope = 10.0.0.11-10.0.0.160 BDC Scope = 10.0.0.161-10.0.0.200

Can I do this while PCs are connected to LAN? How do I switch over ?
Do I just configure it and let it get on with it or do I have to stop
and start DHCP Server services on both machines?

Any other pitfalls to watch for?

akyuenAsked:
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Hypercat (Deb)Connect With a Mentor Commented:
If you are looking for a failover situation where one scope will take over from the other only if the first one fails, then you can do that assuming that you are running Windows 2008 R2.  Here's an article:

http://technet.microsoft.com/en-us/library/ee405263(WS.10).aspx

I have never done this myself, so I can't really speak to the details of doing this or how well it works...I only know of the possibility.

The other, more traditional way, is to have two DHCP servers that use different scopes, as you've described above. Here's an article describing how that works and how to configure it:

http://technet.microsoft.com/en-us/library/cc780311(WS.10).aspx
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