2008R2 Demote DC & Repromote best practice

I have 2 x 2008R2 servers with AD server roles.

the secondary one (SERV2) has gone into USN rollback state from what i can google.
The Active Directory Domain Services database has been restored using an unsupported restoration procedure.
 Active Directory Domain Services will be unable to log on users while this condition persists. As a result, the Net Logon service has paused.


Will have to ask the other IT support if they had to do this before xmas when making some other changes to this system. May be causing some logon issues.

the primary (SERV1) has all FSMO roles. (netdom query fsmo)

SERV1 has AD, App, DHCP,DNS,Print & WebIIS roles. (and is the main intranet server)
SERV2 has AD,DNS,FileServ roles.

what is the best / quickest way to resolve this as the secondary machine is also the file server so repeated reboots can cause interuptions.

is removing the AD role from Serv2 , reboot , Add AD role and reboot the best way to clean up the mess ?  or is dcpromo from command line more appropriate ?
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Robberbaron (robr)Asked:
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peter_fleurConnect With a Mentor Commented:
If you did not make any changes in the AD on the SERV2, i would demote, reboot and promote and reboot. It won't take a lot of time but you have to reboot.

Peter
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Robberbaron (robr)Connect With a Mentor Author Commented:
i ve seen the links.

in terms of demoting, my question was wether to
a.  remove the AD role from the server, or
b. to run dcpromo /forceremoval and the re-enable via dcpromo  http://support.microsoft.com/kb/332199


option a. makes most sense to me if possible,


see EE blog ....
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/A_2182-Removing-Failed-DC-Data-From-Active-Directory.html

this worked fine.
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Robberbaron (robr)Author Commented:
Further reading shows that adding the AD role to server only adds executables, which dcpromo does anyway.

We tried to run dcpromo but it would not do so cleanly, pointing at forceremoval .... then

I completely missed an EE blog on this question !!

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/2003_Server/A_2182-Removing-Failed-DC-Data-From-Active-Directory.html

this worked fine.
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