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DFS-R Initial Replication

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DFS-R Initial Replication

Postby guest » Thu Jul 29, 2010 10:56 am

Hi, please can you suggest best possible course of action.
Hub and Spoke DFS-R replication over a VPN (stand-alone). Spoke which has run out of file space on drive D: which holds the DFS. I am putting in a new drive and want to avoid replicating 200GB of data over the VPN. Please can you advise if this will work:

Stop Replication service on both hub and spoke
On Spoke add new drive (E:) and robocopy DFS contents from drive D: to Drive E:
Shutdown Spoke server, remove drive D:, Startup Spoke Server and change Drive E: to Drive D: Re-share replication on Drive D: and
finaly start replication service on both Spoke and Hub
Previously on another spoke server which ran out of file space... through DFS management, I removed the existing membership on the spoke, I robocopied DFS contents from D: to new drive E: on spoke and then added the new membership with drive E:. Then it replicated and almost the entire 200GB went across the VPN leaving me with the excess data charges.

Please help.
Thank you in advance
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Re: DFS-R Initial Replication

Postby guest » Thu Jul 29, 2010 10:56 am

Hi Andrew,

That should not happen if the files really are identical. I would prefer to recreate the membership.

Data can be prestaged via. backup or via a normal file copy.


Via Backup read this article: http://support.microsoft.com/kb/947726


Via copy see the following.

http://technet.microsoft.com/en-us/library/cc773238.aspx

Can I seed a replication group member with data prior to the initial replication?

Yes. DFS Replication supports copying files to a replication group member before the initial replication. This "prestaging" can dramatically reduce the amount of data replicated during the initial replication.

To prestage a replication group member, copy the files to the appropriate folder on the destination server(s), create the replication group, and then choose a primary member. Choose the member that has the most up-to-date files that you want to replicate because the primary member's content is considered "authoritative." This means that during initial replication, the primary member's files will always overwrite other versions of the files on other members of the replication group.

For more information about the initial replication, see the TechNet article about what to expect during initial replication (http://go.microsoft.com/fwlink/?LinkId=75044).


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Re: DFS-R Initial Replication

Postby guest » Thu Jul 29, 2010 10:57 am

Hi Daemon-FF,


According to the research, you have 2 Windows Server 2008 DCs in the domain, and you try to make SYSVOL folder on of the DCs as authoritative. You may need to perform full backup of the DCs, then perform restore of the DC that need to be authoritative, then create a registry key on the DC to make the SVSVOL folder as "Primary member" in Directory Service Restore Mode. The new DC will sync its' shared out SYSVOL folder with the other replication partner DC after reboot into normal mode.



General steps:

===========



1. Perform a full server backup of the DCs.



2. Perform full server recovery of one of the DC that need to be authoritative



Perform full server recovery of a domain controller

http://technet.microsoft.com/en-us/library/cc772519.aspx



3. Reboot the DC into DSRM, please create the following registry key on the DC to mark SYSVOL as authoritative one.



HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR



Create a subkey with the name Restore. Set REG_SZ value of this key is a to "authoritative"(without quotation mark)



4. Then reboot into normal mode.



Please note:



The Distributed File System Replication (DFSR) service supports the Restore registry key. Any backup application that performs system state backup and restore of SYSVOL should use this key to indicate whether the backup and restore operations are authoritative or nonauthoritative. This key is read by the DFSR service. If this key is not set, the SYSVOL restore is performed nonauthoritatively by default.



If the Restore registry key does not exist, the backup application should create it under the following registry key:



HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR



Create a subkey with the name Restore. The default value of this key is a REG_SZ value that should be set to either "authoritative" or "non-authoritative" based on the system administrator's request.



For more detail steps, please refer to:



Registry Keys for Backup and Restore

http://msdn.microsoft.com/en-us/library/bb891959(VS.85).aspx



Steps for Backing up and Recovering AD DS

http://technet.microsoft.com/en-us/library/cc753359.aspx



Hope it helps.


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