Adding a 2008R2 Child Domain to a 2003R2 forest

Discussion in 'Active Directory' started by Grunt, May 1, 2010.

  1. Grunt

    Grunt Guest

    I have a 2003R2 forest with two root servers in the root domain, A, and
    no other servers in that domain. Under that I have two child domains B,
    and C. I want to add a third child domain, D to this which will have
    two 2008R2 DCs that are not DNS servers. My plan is to move all the DCs
    to 2008R2 over the next several months but we have a requirement for
    another child domain and this seems like a good time to start moving to
    2008R2 for the DCs. All DCs are 2003R2 servers and the domain is 2003
    Functional level. I've read various sources including these and have
    some questions.

    1. If I am adding a 2008R2 child domain do I still need to run the
    adprep /forestprep and adprep /domainprep against my current DCs in the
    forest root? Is the purpose of these to bring 2003R2 Schema up to the
    same level as 2008R2?

    2. Once that is done I assume I can then add servers, run dcpromo and
    create the new domain as a child of A?

    3. Any suggestions, comments about the process or what I need to do are

    Thank you.
    Grunt, May 1, 2010
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  2. Hello Grunt,

    1. yes, the schema master exists once in a forest on the root domain and
    MUST be upgraded with adprep /forestprep and in each domain that should have
    Windows server 2008 R2 DCs you must run adprep /domainprep

    2. yes, it should work after preparing the root domain

    3. before starting make sure to have a tested backup of the root domain and
    each child domain DCs, so if something goes wrong(worst case scenario) you
    can do a forest recovery according to:

    Also before starting run the support tools dcdiag /v, netdiag and repadmin
    /showrepl to check for errors on the DCs and solve them. Additional controll
    each DCs event viewer for errors.

    Also DNSLint should be run (
    dnslint /ad /s "DC ip address"

    Best regards

    Meinolf Weber
    Meinolf Weber [MVP-DS], May 1, 2010
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  3. Grunt

    Grunt Guest

    Thank you. I'll read these links and lay out my game plan.
    Grunt, May 1, 2010
  4. Check out an artcile I have on upgrading your forest at
    Select Upgrade Your Forest to 2008

    Paul Bergson
    MVP - Directory Services
    MCITP - Enterprise Administrator
    MCTS, MCT, MCSE, MCSA, MCP, Security +, BS CSci
    2008, Vista, 2003, 2000 (Early Achiever), NT4
    Microsoft's Thrive IT Pro of the Month - June 2009

    Please no e-mails, any questions should be posted in the NewGroups. This
    posting is provided "AS IS" with no warranties and confers no rights.
    Paul Bergson [MVP-DS], May 3, 2010
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