What method of upgrading from a 2003 domain controller

We currently have 2 DC's for our AD. these are the primary DC's.

We want to bring in 2 new 2008 dc's to replace them.

What is the best method for this and what should I be aware of when migrating from 2003?

thanks for any info.
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GovvyConnect With a Mentor Commented:
Install new DC's alongside existing 2003 DC's

Move FSMO roles to new DC's

Update DNS settings of workstations and member servers to new DC's

Demote 2003 DC's

Migrate Domain/Forest Functional Levels to 2008

Enable AD Recycle Bin functionality

Migrate SYSVOL replication from FRS to DFS-R
Mike KlineConnect With a Mentor Commented:
Similar question asked a few minutes ago


I'd go with 2008 R2 at this point


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rdefinoAuthor Commented:

could you detail this task a bit:

Update DNS settings of workstations and member servers to new DC's
Darius GhassemCommented:
You need to go into DHCP Scope options to change the DNS servers IP addresses.
As darius describes above for any workstations that use DHCP (could potentially require network switch update if DHCP is issued there)

Additionally the manual DNS settings under TCP/IP properties of member servers will need to be updated with the new IP addresses of the 2008 DC's
SandeshdubeyConnect With a Mentor Senior Server EngineerCommented:
There are a couple of very important considerations, that you should have in mind, before you proceed with your migration scenario.
--Check, and raise, if necessary, the Domain and Forest functional levels. You cannot upgrade directly from Windows 2000 mixed, or Windows Server 2003 interim domain functional levels.

--The first Windows Server 2008 Domain Controller in the forest must be a Global Catalog Server, and it cannot be a Read Only Domain Controller, RODC.

--Check the FSMO roles assignments. When you prepare the existing AD, you should run adprep /forestprep on the Schema operations master, and adprep /domainprep /gpprep on the infrastructure master.In your case as there is a single Dc you need to run on the same server.

Steps to Install Windows 2008 DC

1.First prepare the domain.
Insert Win 2008 DVD on windows 2003 DC and execute adprep as below
Ran D:\2008DVD\Support\Adprep\adprep32.exe /forestprep on the server holding the Schema Master role.
Ran D:\2008DVD\Support\Adprep\adprep32.exe /domainprep /gpprep on the server holding the domain master role.

Reference article:http://www.petri.co.il/prepare-for-server-2008-r2-domain-controller.htm

2.Install DNS role in win2k8
Reference KB article:http://technet.microsoft.com/en-us/library/cc725925.aspx

3.Once DNS role is installed.Ran dcpromo on win2k8 R2.
Reference KB article:http://technet.microsoft.com/en-us/library/cc753720(WS.10).aspx

4.After the Win2k8 Dc promotion is completed restart the win2k8 DC.

5.You must transfer the FSMO roles to the 2008 machine then the process is as outlined at http://www.petri.co.il/transferring_fsmo_roles.htm

6.Ran dcdiag /q and repadmin /replsum on DC to check for any errors.

7.Change all of the clients (and the new 2008 DC itself), to point to the 2008 DC for their preferred DNS server this may be in DHCP options or the TCP/IP settings.

Once both the Dc are promote you can proceed with the demotion of 2003 DC.
rdefinoAuthor Commented:
This is great info, last thing. Any known issues with upgrading from 2003 to 2008R2?
Mike KlineCommented:
Non known issues, if NT was in the mix (some rare networks still have that) then there could be possible issues.
Darius GhassemCommented:
No known issues you should be good to go
rdefinoAuthor Commented:
Tkanks for the help
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