If a link’s No Override option or Disabled option has been changed, RMAD treats the link as having been deleted, and assumes that a new link was created with new options. This behavior is by design.
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 How to force authoritative and non-authoritative synchronization for DFSR-replicated sysvol replication.
RMAD 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:
Start Registry Editor (Regedit.exe), and then locate the registry key:
In the details pane, double-click the ImagePath value, and in the Value data text box, specify the port number in the following way:
%SystemRoot%\RecoveryManagerAD\ErdAgent.exe -I -P:3899
In this example, Backup Agent will use port 3899. When finished, click OK.
Close Registry Editor.
Restart the Backup Agent service.
Start the Recovery Manager for Active Directory Console (snap-in), and then perform the following steps:
In the console tree, select the node RMAD, and then on the Action menu, click Settings.
On the Ports tab, select the Connect to Backup Agent using a specific TCP port. check box, and then specify the port number in the Port text box.
Click OK to close the Recovery Manager for Active Directory Properties dialog box.
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 (RMAD) automatically selects a DC in each domain to perform an authoritative (primary) restore of the SYSVOL folder. To select such a DC, RMAD uses a number of predefined criteria listed in this section. These criteria are listed in the order they are applied by RMAD. If no DC meets the first criteria in the list, RMAD tries to apply the next criteria. RMAD 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):
DC has the PDC Emulator role.
DC has the Domain Naming Master role or Schema Master role in the forest.
DC has the RID Master role in the domain.
DC is a DNS server in the domain.
DC resides in the largest Active Directory® site (as compared to other DCs in the domain).
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