Joining a 2nd DC to a domain

Hi,

I have a domain with one DC, and I want to join a 2nd DC to this existing domain.
The forest and the domain functional level is Windows Server 2003, the ser is Windows Server 2003 R2 Standard Edition Service Pack 2.
I had another DC which I had to substitute the server a few months ago, the server I want to promote to a 2nd DC is a Windows Server 2008 R2 Enterprise 64 bits Service Pack 1, this is a member server from my domain.

What I need to do to promote this member server to a DC in an existing domain??
It's necessary run the addprep and/or the forestprep before run dcpromo??

If you could tell me step by step what's necessary and in which servers, I would apprecciate.

Thanks.

Best Regards.
privateuserAsked:
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privateuserAuthor Commented:
Thanks for your reply.

It's necessary do some short of backup of the AD, or there is no need of that??

I have to do the 2 steps, even the domain and the forest had one windows server 2008 before???

Thanks.

Best regards.
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Spencer SimpsonInformation Technology CoordinatorCommented:
A System State backup of the original DC (before adprep and forestprep) is a Really Good Idea in case something goes wrong.

It doesn't matter if the domain already had a 2008 server if the server wasn't a DC to begin with.  The prep tasks are to upgrade the Active Directory schema to one that Server 2008's version of  Active Directory Services can handle.
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privateuserAuthor Commented:
Hi,

Thanks for your replies, I will do that on this weekend, because the server also is a fileserver.

One more question, how many DC can I promote to an existing domain?
I ask this, because I still have the old DC which had the server2008 in AD??
Can I delete this object from the AD??

Best regards.
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Spencer SimpsonInformation Technology CoordinatorCommented:
DO NOT simply delete a domain controller, no matter what version of the OS it's running.  You have to go through a large number of steps to 'decommission' the DC.

Microsoft has an article that explains how to do this at:
http://technet.microsoft.com/en-us/library/cc816644(v=ws.10).aspx

You can promote as many DCs as you have Windows server licenses for the target version. You could go around with all of your servers as DCs.  Except that's a bad idea.  

AD Infrastructure planning (including DC placement) is a whole subject in its own, and what you come up with depends on your company's needs and policies.    But the short version is, the max number of DCs you want at any one site (defining 'sites' as separated by WAN connections) is probably 2, and that many only in the datacenter.
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privateuserAuthor Commented:
Hi mapwiz,

Thanks for your reply.

I have that idea, there isn't a fixed number of DC's, in my case i will have 2 DC for my domain, one with server 2003 and the other with server 2008 r2 both DNS configured. This will be my scenario and architecture.
When I made the question earlier, was, in AD would appear 3 DCs instead the real 2 installed.
The other isn't working and simply didn't exist on my infrastructure.

Thanks.

Best regards.
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Spencer SimpsonInformation Technology CoordinatorCommented:
If the machine doesn't exist any more, but the machine account is still in AD, you should still follow the steps in the link I sent you to make sure the machine account isn't anywhere else in the AD replication infrastructure.
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privateuserAuthor Commented:
Ok.

When I had the real 2nd DC, i'll follow the steps on the link you gave me.

Thanks.

Best Regards.
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Spencer SimpsonInformation Technology CoordinatorCommented:
Some places to look at casually (but not edit up front) would be under Active Directory Sites and Services, to see if the live DC is still trying to replicate with the dead DC, and in DNS, to see if the dead DC appears in any of the service records (subfolders beginning with underscores) in the active directory integrated zone representing your domain (assuming you have one).  The decommissioning procedure is supposed to clean this up.
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privateuserAuthor Commented:
Hi,

I've read the information on the link you sent, however, it's seems that it have to do in the server i want demote, but I can't access or use the server which was the 2nd domain.

I've tried run forestprep, to prepare the forest and the ad for a server 2008 r2 and it gives me an error:
Adprep was unable to extend the schema.
The scheme master did not complete a replication cycle after last reboot. The schema master must complete at least one replication cycle before the schema can be extended.

This is because i still have the other DC in AD and in AD Sites and Services?

Thanks.

Best regards.
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Spencer SimpsonInformation Technology CoordinatorCommented:
It's because the other DC is down.

I found the following article about Server 2003

http://support.microsoft.com/kb/216498

but it mentions server 2008.   As it turns out, you can clean up server 2008 by doing what you wanted to do in the first place: deleting the computer account from Active directory Users and Computers.
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Windows Server 2008

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