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network with server 2003 and server 2008 adding server 2012

Posted on 2014-03-25
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Last Modified: 2014-03-27
Question may be a bit based on the earlier question i posted. Have an existing server 2003 and a Server 2008 standard, with both as domain controllers (forest and domain function levels set at server 2003 on both). Adding a server 2012 R2 standard and want to add it as a domain controller. Believe going thru the steps it will configure itself at the 2003 level automatically, and add itself as a domain controller to both.
My question is will adding this unit as a domain controler impact functionality of the network during the work day. Will it have to disconnect users in the domain while it registers or will it add itself with no impact since 2 other servers are already controller the domain. Thanks for any help you can provide.
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Question by:columbiaG
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by:mlsbraves
ID: 39954481
I'm assuming your configuring this as a BDC (Backup Domain Controller)? I've added several BDC before and it has never affected anyone.
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by:columbiaG
ID: 39954486
don't think there is any way to make the distinction, you just add it as a DC, no choice as to primary or backup
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by:mlsbraves
ID: 39954514
By default it will assume the role as BDC if your adding it to an existing domain.

You can use the following to figure out which one is your PDC
nltest /dclist: domain.local
replace domain.local with your domain
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by:columbiaG
ID: 39954523
run that on the server or a pc
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by:mlsbraves
ID: 39954540
Any system on the domain is fine

nltest /dclist:domain.local

There is no space after /dclist:

This will list all Domain Controllers for that domain. You will see [PDC] after the system that is your PDC.
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by:columbiaG
ID: 39954552
nope, says it cannot find DC to get dc list from, and present network has 2 domain controllers
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by:mlsbraves
ID: 39954597
Adding another Domain Controller won't disrupt networking for the users. That being said it is a good idea to know which one is your Primary Domain Controller. If this one were to fail your backup domain controller would takeover role as primary. Can you copy the exact error you are getting? Just tested it on a Win 7 client of mine and shows me all 3 domain controllers and indicates the PDC.
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Author Comment

by:columbiaG
ID: 39954914
Ok, figured out what I was doing wrong, it is showing my 2008 server as the PDC, and also lists the 2003 server, just not as the PDC....
So installing the DC on the 2012 will not disrupt anything on my existing net if it is done during working hours while others are logged into the 03 and 08 servers?
Once I install this on the 2012 server, will the 2012 take over as PDC?
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mlsbraves earned 500 total points
ID: 39954939
Adding your new 2012 server as a domain controller will not disrupt your current network or domain environment.

That being said, users and devices in your domain are not using both your 03 and 08 server for AD. They do not load balance resources. Your PDC (server 08) is used for all AD task and only in the event that your PDC fails or stops responding will another BDC be used. If you make changes in the PDC they will automatically be applied to your BDC.

When you add a domain controller to an existing domain it will configure itself as a BDC. If you want to promote your new server as the PDC you can do this by running: dcpromo
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Author Closing Comment

by:columbiaG
ID: 39958936
Thanks for all of your help with this
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