A primary restore is intended to recover the initial member of the SYSVOL replica set, only when the entire replica set has been lost. A primary restore should therefore not be used if there are two or more operational domain controllers in the domain. If there are other members in the replica set with which the restored SYSVOL can synchronize, a primary restore should not be performed, as it disrupts the replication of SYSVOL data.
For more information about primary restore, see the Microsoft article “Authoritative, Primary, and Normal Restores” at http://technet.microsoft.com.
Recovery Manager for Active Directory uses a TCP port to communicate with Backup Agent installed on the target domain controllers to be backed up. To change the Backup Agent port number, perform the following procedures.
On each target domain controller to be backed up, perform the following steps:
%SystemRoot%\RecoveryManagerAD\ErdAgent.exe -I -P:3899
In this example, Backup Agent will use port 3899. When finished, click OK.
Start the Recovery Manager for Active Directory Console (snap-in), and then perform the following steps:
Important: If you are using a firewall, the specified TCP port must be opened. You must specify the same port number for all target domain controllers to be backed up.
When recovering an Active Directory forest, Recovery Manager for Active Directory Forest Edition automatically selects a DC in each domain to perform an authoritative (primary) restore of the SYSVOL folder. To select such a DC, Recovery Manager for Active Directory Forest Edition uses a number of predefined criteria listed in this section. These criteria are listed in the order they are applied by Recovery Manager for Active Directory Forest Edition. If no DC meets the first criteria in the list, Recovery Manager for Active Directory Forest Edition tries to apply the next criteria. Recovery Manager for Active Directory Forest Edition keeps going through the list of criteria, from top to bottom, until it finds a suitable DC.
Criteria used to determine if a DC is suitable for an authoritative (primary) restore of the SYSVOL (in the order of priority):
The overall success of a domain or forest recovery operation very much depends on the domain controllers being restored from backups. Not only it is important to ensure these domain controllers are restored from recent and trusted backups, it is also necessary to temporarily isolate these domain controllers to guarantee that no dangerous or unwanted data will be replicated to them from their replication partners and to block requests to Active Directory from client workstations during the recovery. Recovery Manager for Active Directory Forest Edition isolates domain controllers by creating a service dependency and using custom Internet Protocol security (IPSec) rules.
Before isolating the domain controllers being restored from backups, Recovery Manager for Active Directory Forest Edition backs up the IPSec settings existing in your environment to revert to these settings later.
Then, at the recovery step named Enable domain controller isolation, Recovery Manager for Active Directory Forest Edition does the following:
The IsolateDC.bat file is located in the Recovery Manager for Active Directory Forest Edition installation folder (by default, this is %ProgramFiles%\Quest\Recovery Manager for Active Directory Forest Edition). The IPSec rules defined in the IsolateDC.bat file block all IP traffic between the domain controllers and their replication partners, except for the IP traffic generated by the following tools/services:
These IPSec rules also apply to the IP traffic from the domain controllers to the Forest Recovery Console computer. Traffic from the Forest Recovery Console computer to the domain controllers is not affected by these IPSec rules.
Note: You can edit the IsolateDC.bat file to define the IPSec rules that become active during recovery. However, we cannot guarantee that problems that may occur if you incorrectly edit the IsolateDC.bat file can be solved. Edit the IsolateDC.bat file at your own risk.
At the recovery step named Ensure that domain controller isolation is disabled, Recovery Manager for Active Directory Forest Edition removes the dependency between the Active Directory Domain Services service and the NTDS service and uses the UnisolateDC.bat file to revert to the pre-recovery IPSec settings.
The UnisolateDC.bat file is located in the Recovery Manager for Active Directory Forest Edition installation folder (by default, this is %ProgramFiles%\Quest\Recovery Manager for Active Directory Forest Edition).