(2010-08-12) Restoring The SYSVOL (Non-)Authoritatively When Either Using NTFRS Or DFS-R (Part 3)

This post focuses on restoring the SYSVOL when replicated through the DFS-R mechanism. For the previous posts see here and here.

SYSVOL Replicated Through DFS-R – Authoritative Restore – Steps To Take

To perform an authoritative restore of the SYSVOL when using DFS-R, use the following steps:

• Start the Registry Editor
  
• Navigate to "HKLM\SYSTEM\CurrentControlSet\Services\DFSR"
  
• Create a key called "Restore" (only time only)
  
• Create a string value called "SYSVOL" (only time only)
  
• For the string value called "SYSVOL" assign the value of authoritative
  
• Navigate to "HKLM\SYSTEM\CurrentControlSet\Control\BackupRestore"
  
• Create a key called "SystemStateRestore" (only time only)
  
• Create a string value called "LastRestoreId" (only time only)
  
• For the string value called "LastRestoreId" [1] assign the value of 10000000-0000-0000-0000-000000000000
  
• Stop the DFSR Service
  
• Start the DFSR Service
  

From the command-line the same can be achieved through:

• REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\DFSR\Restore" /v SYSVOL /t REG_SZ /d "authoritative" /f
  
• [1] REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\BackupRestore\SystemStateRestore" /v LastRestoreId /t REG_SZ /d "10000000-0000-0000-0000-000000000000" /f
  
• NET STOP DFSR
  
• NET START DFSR
  

[1] When a backup application performs a system state restore, it must indicate that it has done so by setting the LastRestoreId registry value. The LastRestoreId is a GUID that is formatted as 00000000-0000-0000-0000-000000000000. The GUID has to be different each time a restore is requested. For example, if you have the LastRestoreId set as 10000000-0000-0000-0000-000000000000, for the next restore you have to set it to a different GUID, such as 20000000-0000-0000-0000-000000000000. For more information about setting LastRestoreId, see Registry Keys and Values for Backup and Restore.

As soon as the DFS-R Service starts, the following events appear with information about the non-authoritative restore.

Event ID 2109

Event ID 2110

Event ID 4106

Event ID 4108

SYSVOL Replicated Through DFS-R – Non-Authoritative Restore – Steps To Take

To perform a non-authoritative restore of the SYSVOL when using DFS-R, use the following steps:

• Start the Registry Editor
  
• Navigate to "HKLM\SYSTEM\CurrentControlSet\Services\DFSR"
  
• Create a key called "Restore" (only time only)
  
• Create a string value called "SYSVOL" (only time only)
  
• For the string value called "SYSVOL" assign the value of non-authoritative
  
• Navigate to "HKLM\SYSTEM\CurrentControlSet\Control\BackupRestore"
  
• Create a key called "SystemStateRestore" (only time only)
  
• Create a string value called "LastRestoreId" (only time only)
  
• For the string value called "LastRestoreId" [1] assign the value of 10000000-0000-0000-0000-000000000000
  
• Stop the DFSR Service
  
• Start the DFSR Service
  

From the command-line the same can be achieved through:

• REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\DFSR\Restore" /v SYSVOL /t REG_SZ /d "non-authoritative" /f
  
• [1] REG ADD "HKLM\SYSTEM\CurrentControlSet\Control\BackupRestore\SystemStateRestore" /v LastRestoreId /t REG_SZ /d "10000000-0000-0000-0000-000000000000" /f
  
• NET STOP DFSR
  
• NET START DFSR
  

[1] When a backup application performs a system state restore, it must indicate that it has done so by setting the LastRestoreId registry value. The LastRestoreId is a GUID that is formatted as 00000000-0000-0000-0000-000000000000. The GUID has to be different each time a restore is requested. For example, if you have the LastRestoreId set as 10000000-0000-0000-0000-000000000000, for the next restore you have to set it to a different GUID, such as 20000000-0000-0000-0000-000000000000. For more information about setting LastRestoreId, see Registry Keys and Values for Backup and Restore.

As soon as the DFS-R Service starts, the following events appear with information about the non-authoritative restore.

Event ID 2109

Event ID 2110

Event ID 4110

Event ID 4102

Event ID 4604

–

Cheers,
Jorge
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