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Posted on 2016-11-12
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I need to know following
1) steps for authoritative and non authoritative restore of domain controller
2) in what situation one performs D2 and D4 restore, does it anything to do with USN
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Question by:pramod1
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Senior IT System Engineer earned 2000 total points
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Hi Pramod,

The D2 is generally called Non-Authoritative.
D2 is a registry key entry which is used as a FRS non-authoritative restore which is used to bring the local FRS replica set back up to date with its partners. The is completed by comparing all the local files in the replica with the ones of its upstream neighbour. The D2 element refers to the BURFLAG (Backup and Restore Flag) registry key. When this registry key is populated with a D2 entry this directs the local replica to re-initialize with its upstream partner.

The D4 is called Authoritative
D4 is a registry key as above which is used by FRS to signify an Authoritative restore. This makes the current replica set of existing files authoritative for all the members of this replica set. The FRS replication service MUST be stopped on all replication partners of a replica set before carrying out this procedure otherwise you will initiate a morphed condition. (More about morphing tomorrow). IMPORTANT you must only perform the two procedures above by first consulting your support provider, as it is often a last resort solution. Also thoroughly read the following KB article http://support.Microsoft.com/kb/315457/.

When should you use them?

Don't just go ahead with D4/D2. D4/D2 shall be the last resort except the followings:

FRS computer is throwing JOURNAL WRAP Errors in the FRS Event Log
Junction Points have been changed or deleted
File/folders are morphed
For troubleshooting FRS and when you to use D4/D2, please check the following Knowledge Base at Microsoft site:

http://technet.microsoft.com/en-us/library/Bb727056.aspx
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