Windows Server 2003 to 2012 Migration into a mixed Windows server enviroment
Posted on 2014-07-25
I'm currently managing a windows environment running all Windows 2003 servers (1 master DC and 2 DCs) ; all running AD, DFS, DNS, and DHCP services.
As you can see its time for us to upgrade, so the plan I have is to upgrade all existing windows 2003 servers to a newer version of Windows NOS.
-Master DC: windows 2003 -> 2012 (new box)
-Other two DCs: Windows 2003->2008 (using OS using existing hardware)
So my approach is (rough draft):
1) Add the Windows 2012 R2 server to the domain, then migrate AD from 2003.
2) Add all the services I need on the new server
3) Add Windows 2012 R2 as a DFS member, namespace, and start DFS replication
3) Promote the Windows 2012 DC, and demote the 2003 server
4) Install and configure Windows 2008 server
5) Add the both Windows 2008 server to domain
6) Update AD and make sure AD is replicating
7) Add required domain services
8) Add both Win 2008 as a DFS member, add namespace, and start DFS replication
9) Demote existing Windows 2003 server from domain
Can you anyone who has perform a similar migration or is familiar with this migration, give me their opinion if this is the right approach? If I'm missing a step, please comment.
Also, this is my first time migrating an existing DFS. Is this the right approach...should I configured and migrate DFS on the server and add it as a member before demoting Windows 2003 servers? I figured if I do it this way it will minimize the down time.
Thanks in advance!