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Update Child Domain to 2008 from 2003 concerns

Posted on 2011-03-16
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Last Modified: 2012-05-11
Hello
Within my company we now run 2008 at the top of the Forest, then within that forest sits our parent domain, who are running 2003 currently, and then we are a child domain of theirs and we run a 2003 domain as well.

The question is, been as at forest level it is 2008, can I update my domain to 2008 also, even though my parent domain is on 2003? Or does my parent domain also have to be 2008 before I upgrade?
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Question by:RPUKsupport
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Expert Comment

by:JBond2010
ID: 35146202
You need to run Forest/Prep - Domain/Prep by your comment you have already done this.

When you upgrade all the Server to 2008, you can then raise the Forest and Domain Functional Levels to 2008.
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Expert Comment

by:JBond2010
ID: 35146228
It is also worth noting that in order to raise these levels you need to be a member of the Domain Admins group or Enterprise Admins group. You can do this from Active Directory Domains and Trusts.
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Expert Comment

by:Muzafar Momin
ID: 35146271
you can update the domain to 2008 it will not impact
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Expert Comment

by:Tonypeswani
ID: 35146275
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Author Comment

by:RPUKsupport
ID: 35146279
Thanks, I know how to do that part, I was unsure of the local domain level as I am the child domain of a 2003 domain if that makes sense.
Sounds like all I need to do is get a couple of 2008r2 servers and go from there?
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Accepted Solution

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JBond2010 earned 250 total points
ID: 35146288
Once you have raise the Domain and Forest functional levels there is no going back. So, make sure you have access everything to prepare for the upgrade.

Also, know which Domain Controllers hold the FSMO Roles. This is very important. There are 5 FSMO Roles, The Schema Master Role, Domain Naming Master Role, the Infrastructure Master Role, the RID Master Role and PDC Emulator Role.

Make sure to transfer these Roles to a Windows Server 2008 Domain Controller.

Because, you have a child Domain you will have 3 FSMO Roles - The RID Master, the Infrastructure Master and the PDC Emulator. These 3 roles are Domain Wide. The Schema Master and the Domain Naming Master are Forest Wide and they reside on the first Domain Controller installed in the Forest.
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Assisted Solution

by:Awinish
Awinish earned 250 total points
ID: 35146664
Domain functional level depends on level of OS running in it & forest functional level depends on DF.L
You raise the DFL when all the OS of DC(not to confuse with memberserver, in windows 2003 domain you can run member server with windows 2000)is at same level.
You need to run adprep32.exe /domainprep on child domain & still you can introduce windows 2008 DC with FFL set to windows 2008.

Take a look at my artcile.
http://awinish.wordpress.com/2011/03/04/upgrade-from-windows-2003-to-20082008-r2-domain-controllers/
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