====== Transfer or seize FSMO roles ======
<code msdos>
ntdsutil
roles 
connections 
connect to server <FQDN of role holder>
quit 
seize schema master
seize naming master
seize RID master
seize PDC
seize infrastructure master
quit 
quit 
</code>
Use **transfer** keyword instead of the **seize** keyword, if the old DC is accessible

Open Active Directory Sites and Services, expand tree <site name> \ Servers \ <server name>

Open properties on NTDS Settings, and remove the tick from 'Global catalog' checkbox