Here is a little background. We have 5 sites. There is a VPN between all of the sites.
Site 0 has the 5 Windows Based workstations for staff which are currently in a workgroup only. There are NO Windows/Linux/UCS servers at this site yet. (Planned at some point, but none currently)
Site 1 has our UCS Master DC and UCS Backup DC, also has several Turnkey/Vendor Application Appliances and Linux database servers.
Sites 2 , 3 and 4 have a Single UCS Slave DC in each site, plus there are various Windows Application servers, Linux Applications Servers, several UCS Member Servers acting as application servers and two UCS General purpose file servers spread across sites 2 ,3 and 4.
I would like to migrate from a Windows work-group to a single Windows Domain for the Windows Application Servers and Workstations. I am wondering if I need to install the Windows Active Directory Compatible Domain Controller at each UCS DC or just on the Master and Backup DCs.