Migrating to Server 2008

Posted on 2011-05-09
Last Modified: 2012-06-21
Currently we have all 2003 servers with 4 domain controllers.  I am starting to upgrade the servers to 2008.  I have read how to do an "In-Place Upgrade" of my primary domain controller 1st question: - is this a standard accepted practice? - The instructions show how to prepare a domain controller for the upgrade by inserting the 2008 server disk and running adprep/ forestprep  and adprep/ domainprep - does this push to all 4 of my 2003 domain controllers? then it shows upgrading the 2003 domain controller to 2008 from the 2008 DVD.  what about the other 3 2003 servers, do i have to upgrade them to 2008 or can i leave them at 2003? (two are in different states)  or should I demote them?

Thank you in advance.
Question by:BFanguy
    LVL 57

    Accepted Solution

    I'd say the more common practice is to stand up new boxes and put 2008 (or 2008 R2 at this point).

    yes the adprep only has to be done once for the forest and once for domain and that will repliate

    You can leave the other 3 at 2003 (having a mix of 2003 and 2008 (or 2008 R2)) is fine.  You won't be able to raise your functional levels until all your DCs are at the newer version.

    more info here


    LVL 95

    Assisted Solution

    by:Lee W, MVP
    Agree - few (if any) experienced admins that I know would recommend the in-place upgrade method.  It can work, but a CLEAN system is almost always more reliable.  ADPREP /forestprep needs to be run on the Schema Master role holder (Make sure the user account logged in running the command is a member of the Schema Admins and Enterprise Admins group and ADPREP /domainprep needs to be run on the Infrastructure Master role holder.

    For more information, I recommend referencing Dan Petri's articles on the subject: (for 2008) (for 2008 R2)

    Author Closing Comment

    Thanks, guys.

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