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Restoring AD DS

You might need to restore AD DS for two reasons: The first reason is if your database is unusable—perhaps because one of your domain controllers has experienced a hard disk failure or because the database has been corrupted to the point where it cannot be loaded. The second reason is if human error has created a problem with the directory information. For example, if someone has deleted an OU containing several hundred user and group accounts, you will want to restore the information rather than reenter all the information.

If you are restoring AD DS because the database on one of your domain controllers is not usable, you have two options. The first option is to not restore AD DS to the failed server at all, but rather to create another domain controller by promoting another server running Windows Server 2008 to become a domain controller. This way, you are restoring the domain controller functionality rather than restoring AD DS on a specific domain controller. The second recovery option is to repair the server that failed and then restore the AD DS database on that server. In this case, you will perform a nonauthoritative restore. A nonauthoritative restore restores the AD DS database on the domain controller, and then all the changes made to AD DS since the backup are replicated to the restored domain controller.


  

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