Migrating from Windows Server 2003 to 2012 R2 on same hardware

windows-server-2003windows-server-2003-r2windows-server-2012windows-server-2012-r2

I have two Windows Server 2003 R2 Active Directory Domain Controllers which serve about 100 nodes. I need to upgrade to 2012 R2 on the same hardware (which exceed the minimum requirements). Since I can not do an in place upgrade from 2003 to 2012, what are my options using the same hardware?

We are purchasing a new web server as well. I'm considering using this server as a new domain controller to make the migration easier, then using the older dc as our web server once the migration is complete. But this still leaves me with the 2nd 2003 domain controller which I need to update.

I would be grateful for any assistance!

Best Answer

  • Take the new machine. Install 2012 R2 as DC.
  • Wipe one of the old DC, install 2012 R2 and make it a DC
  • Wipe other old DC, install 2012 R2 and make it a DC
  • Demote new machine (possibly reinstall it) and use it as web server.
  • Remember to upgrade the domain functional levels.

Done, without ever having only a single DC.

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