Windows 2012 AD Services
Functional Level 2003 raised to 2008 R2
on domain controllers issue
net share – check if the sysvol are shared
repadmin /replsum – to check if the synchronization is working
regedit then HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Netlogon\Parameters then check that entry SysvolReady is 1. You need to check on all domain controllers.
services.msc – check if the DFS Replication in the extended tab is set up Automatic Startup
MIGRATE FUNCTIONAL LEVEL
In my case I was on 2003 so had it raise it to 2008 (2008 R2).
First Make sure that all your AD server are within the level you raise.
So if you raise to 2008 R2 all your AD servers need to run at least Windows Server 2008 R2
Administrative Tools Folder -> Active Directory Domains and Trusts Right click on domain then click on Raise domain functional leven Then choose the one you want from the list. Click Raise. This should only take few second. Once done on Primary AD the changes should be made to all of them.
to check which your DC is Primary issue
You will see that one of your DC has got [PDC] flag which means it’s primary
MIGRATE THE DOMAIN TO THE PREPARED STATE
Check install role Windows Server Backup from Add role control panel. It should on the second list of services after you press Next first time.
To make a state backup run: https://technet.microsoft.com/en-us/library/cc742124.aspx
wbadmin start systemstatebackup -backupTarget:\\myshare\dc1
Wait until backup is finish it may take some time.
SET GLOBAL STATE ON PDC DOMAIN CONTROLLER IDEALLY (Make sure it’s not RODC) (Read-only) https://blogs.technet.microsoft.com/askds/2011/10/28/friday-mail-sack-they-pull-me-back-in-edition/#netdom
Use the command below firs to check then move it says Start dfsrmig /setglobalstate 1
Do not progress further until all domain controllers are showing “Prepared” state
THIS PROCESS MAY TAKE SOME HOURS/DAYS