I currently have 5 Servers
2 DC Windows 2003 Enterprise 32 bit migrating to 2012
1 Member server 2003 Enterprise 32 bit migrating to 2012
2 Windows 2008 Member Servers. both 64 bit both staying as member servers on 2008 platform.
2008 1 SQL 2008 Server
2008 2 Exchange 2010 Server
since windows 2003 Server support is ending this July 2015 it is time to plan an upgrade.
My plan is to upgrade the Windows 2003 servers to Windows 2012 R2 Standard 64 bit
The Windows 2003 Member server is no problem runs a few third party apps that I need to check out for 2012 support.
Again should be no problem.
My concern is the DC's
since I have two DC's I would like to use the same physical hardware as I have now.
Currently all FSMO Roles are on one DC lets call it DC2
DC1 runs DNS DHCP WINS IIS 6 SharePoint Global Catalog GC
DC2 runs DNS DHCP WINS IIS 6 for my hosted Sites Global Catalog GC
My thinking is that I can Demote DC1 then rebuild as Windows 2012 DC
SharePoint can be down that is not a problem I believe SharePoint 2013 runs in the 2012 Server environment.
As far as DHCP DNS and WINS that will be handled by DC2
All my primary devices have DHCP reservations which are defined in both DHCP servers and the scopes are with my 10.2.8.0/22 network.
When ready to demote I can use this
once demoted then can I install windows 2012 Server using same Serer name and ip address? or should I use new name and new ip address. I have had in the past issues with DC's and always had to use new name and ip address
Once this new 2012 server is online
On DC2 I need to run adprep32
Then I can add the AD services on the 2012 Server
Is this all I need?
Now when the 2012 Server is a DC and all is replicating well I can move all the FSMO roles to the new Dc correct?
Once the new Server 2012 DC has all the FSMO roles then I should be able demote DC2 and install 2012 on it.
Am I missing anything?