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Upgrade Win2003 Domain Controller to Win2008

Posted on 2009-07-06
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Last Modified: 2012-05-07
I am currently running a native W2003 forest with 2 domain controllers - obviously both win2003 machines. DC1 is the primary domain controller with all the FSMO roles. DC2 is an older machine that I will eventually decommission once the newer win2008 domain controller is in place.

The win2008 machine, DC3,  is currently a member server of my domain. In order to make the win2008 a domain controller, I understand that I should do the following-
1. adprep /forestprep
2. adprep /domainprep

Both these 2 steps should be run on DC1?
Can someone kindly also highlight any pitfalls to look out for before I do dcpromo on DC3?
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Question by:frukeus
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Mike Kline earned 500 total points
ID: 24783449
Yes run those do the adprep on DC1 that holds all the FSMO role holders.
No pitfalls really, couple of questions
1. How is DNS setup right now?  Are you running AD Integrated DNS?
If you are you will also want to make the 2008 box a DNS server?
Make the 2008 box a global catalog too, it will be checked by default in the 2008 dcpromo.
The only potential issue is down the road.   Is your 2008 box x32 or x64?   The reason I mention that is because Windows 2008 R2 will be released in a few months and will only be a x64 so if you are running x32 now you won't be able to add R2 unless you go to x64.
Sander also has a good writeup on moving to 2008
http://blogs.dirteam.com/blogs/sanderberkouwer/archive/2008/03/02/transitioning-your-active-directory-to-windows-server-2008.aspx
Thanks
Mike
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by:frukeus
ID: 24783471
Yes, DNS is AD integrated and I do plan to run DNS and DHCP on the new DC3.
The DC3 is actually a x32 win2008 virtual machine running off a win2008 x64 EE hyperV host.

No plans to do win2008 R2 as I do not have Software Assurance for my win2008 license.

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by:Mike Kline
ID: 24783497
Ok then before that second 2003 is taken off I'd make sure to have clients also point to the 2008 box for DNS...I'm sure you were going to do that.
Understood about the licensing.
Thanks
Mike
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