Backup Domain Controller

Hi there,

I want to add a Windows Server 2008 R2 as Back-Up Domain Controller to a Domain which has a Windows Server 2003 R2 as Primary Domain Controller.I've all the FSMO roles on this single 2003 primary domain controller.
So when I'm trying to prepare this Existing 32-bit Windows Server 2003  Domain Controller for the setup, and when I issue an "adprep32 /forestprep" command, I'm getting the error
" Forest-wide information has already been updated.
Adprep did not attempt to rerun this operation "

And the same happens when I issue an "adprep32 /domainprep" command,that is  Im getting the following error
" Domain-wide information has already been updated.
Adprep did not attempt to rerun this operation

How can I fix this please ?

Clement PAsked:
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Clement PAuthor Commented:
Sorry the primary DC is a Microsoft Windows Server 2003 for Small Business Server with SP2 server
Seth SimmonsSr. Systems AdministratorCommented:
it means the schema has already been extended; adprep only needs to be done once when you are introducing a domain controller of a newer operating system

you should be able to promote the 2008 R2 server

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Lee W, MVPTechnology and Business Process AdvisorCommented:
Agree with Seth.  

The message is telling you what's going on. "Forest-wide information has already been updated."  If it's already done, you don't need to do it again.

ADPREP = AD Prepare

You are PREPARING AD for a newer version of Windows Server.  Once it's been prepared, it's done.  It never needs to be done again for that version of Windows or earlier.
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Clement PAuthor Commented:
Thank you both.

I successfully installed a New Backup DC on 2008 R2.
However I've couple of questions please.

1) My Primary DC is - I've my primary DNS, DHCP running on this
 So now I've New 2nd Domain Controller in the  Domain as and for this  the preferred DNS server would be and Secondary as ...isn't it ?

Also 2) How should I Configure DHCP on this New Back-up DC for Failover please ?

Lee W, MVPTechnology and Business Process AdvisorCommented:
You would need a split scope - your first DHCP server would have a range of, for example, and the new server would provide 192.168.126-200.

DNS doesn't matter too much - I'd have each DC point to themselves with the other as secondary.  The clients don't matter much.  DNS (and AD) replicate with each server.
Clement PAuthor Commented:
Ah okay.

So with regards to DHCP - Splitting the scope is the only option ? Because lets say if my primary DC goes down and the BDC kicks in and authenticates users however it would through a new set of ips isnt it ?  I man the PC which was getting an IP as from PDC, may get a new one from the BDC ? Isnt it ?  
Is there any solution where the IP's remain same irrespective of  PDC or BDC running please?

Lee W, MVPTechnology and Business Process AdvisorCommented:
There is no such thing as a BDC or PDC in Active Directory.  That's 15 year old terminology that expired with NT4.  

The only solution for preserving thee DHCP assignments is a clustered DHCP server.  WAY overkill.  Why do you care what IPs the workstations get as long as they get IPs?  You could create reservations for each DHCP server and always get one address or the other.  Or set all your addresses statically - then you aren't using DHCP and IPs never change.
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Windows Server 2003

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