Domain Upgrade Server 2012 R2 Prep

I currently have 3 domain controllers all Running either Server 2008 and/or Server 2008 R2.  I will be installing and promoting 3 new Server 2012 R2 Domain controllers.  I am a bit confused as to how to prep the domain to get ready for this.

Some say the dcpromo wizard upgrades the domain automatically, and some say before introducing the new servers, run the command line prep utilities.....

What is the proper way to do this......
BSModlinAsked:
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Wilder_AdminConnect With a Mentor Commented:
these things are depending on each but they do different stuff. First you put the the new servers to the domain. Then you make them to dc with the dcpromo after you use the command line prep tools for upgrading the activedirectory database to its new level ( how the database looks) which fields etc.

A good guidance is here: http://www.petri.com/promote-member-server-to-domain-controller-windows-server-2012.htm
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akalyan911Connect With a Mentor Technical ConsultantCommented:
Hi BSModlin,

Before adding new 2012 ADC on 2008 R2, i would suggest you to kindly check the domain level and forest level function. it suppose to be 2008 R2.

once it is completed, you can add the new 2012 server as ADC. just you have to run Dcpromo and follow the steps.. it will automatically check the functional level and upgraded to 2012 AD.

once all roles were migrated to 2012 servers, you can go for metadata clean up.. hope you know the process..

it is very cool process, don't get confuse.. if you have two day time. i can share the video... :)
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
ADPREP is now done when installing AD automatically.  There is no need to perform a manual ADPREP.
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BSModlinAuthor Commented:
does it hurt, or is it better to do it manually?
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Cliff GaliherCommented:
It does the exact same thing either way. the adprep command-line utility checks each schema file and applies it if necessary. And the automatic method within the wizard uses the same schema files and does the same checks.  It is like comparing dragging a file in file explorer or typing "copy" in the command line.  Windows internally handles both actions the same way (note I am just comparing copy, not xcopy or Robocopy, etc.)
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