Decommissioning a domain controller – Possible Scenarios

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    I am in the process of upgrading my window server 2003 to 2012 R2.

    I have introduced a swing DC,installed 2012 on it,ensured that replication is occuring between the two and succesffully transfered the roles from the old DC to the new temporary 2012 DC.

    Refer to this thread for the procedures in use

    Now i intend to decommission the old 2003 server , and to a fresh reinstallation of 2012 in it,then once i ensure replication has occured, transfer back the roles and decommission the swing DC

    Both server are global catalogs..

    My question is this, Do i just do a fresh reinstallation of the 2012 on the old server 2003 without first demoting it? or do i demote it ,test and then install 2012 on it…

    Since the servers are GC both,is there a possibility that when i demote the old DC the DNS,AD details that had replicated dissapears?

    What any other cautions should i check?


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