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Will adding a 2012 server as a Domain Controller in a 2008 Domain raise the domian function to 2012?

Posted on 2015-01-26
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Last Modified: 2015-01-27
We have a domain that is currently 2008 servers as domain controllers.  We are ready to set up Server 2012 DCs.  We have added the role to a 2012 server, but have not promoted it just yet.

We are at step 11 of this tutorial http://www.petenetlive.com/KB/Article/0000680.htm.

My question is will allowing the wizard to prep the forest, schema and domain going to raise the function level to 2012 or will it remain at 2008?
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Question by:aksealife
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by:Will Szymkowski
Will Szymkowski earned 167 total points
ID: 40571383
Adding the 2012 domain controller will not raise the functional level. This is a manual operation. You will only be able to raise the functional level once you have removed all of the 2008 domain controllers and there are only 2012 DC in your environment.

Will.
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by:aksealife
ID: 40571414
This was our thinking as well.  We had a nasty experience when we went from 2003 to 2008 and just needed a little reassurance that out thinking was correct.
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Learnctx earned 166 total points
ID: 40571456
The only change will be a schema update for 2012 domain controllers (functional level will never increase without manual intervention). This would have been the same as when you started adding 2008 servers to your 2003 domain. The process is more hardy these days though and it is very rare that there would be a problem. In 2012 when you promote your first 2012 DC it will automatically apply the schema upgrade. Always have a backup and rollback strategy in place though :)
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by:Lee W, MVP
Lee W, MVP earned 167 total points
ID: 40571953
Agree - Forest and Domain Functional levels never automatically increase.  They may be automatically set at the creation of a new domain from scratch, but adding a newer DC to an existing domain does not raise their levels.  The preps MUST be run because the newer DCs expect the AD to contain certain fields in certain areas - old DCs will simply ignore them.  And if the functional levels aren't high enough, even though the DCs want the fields to be present, they won't allow SOME of them to be used until ALL DCs reach a level that can provide necessary services.
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