After you minimize locks on the files that will be replicated, you can pre-seed the files from the source server to the destination server. You can run Robocopy on either the source computer or the destination computer. The following procedure describes running Robocopy on the destination server, which typically is running a more recent operating system, to take advantage of any additional Robocopy capabilities that the more recent operating system might provide.
Sign in to the destination server with an account that's a member of the local Administrators group on both the source and destination servers. To pre-seed the files from the source to destination server, run the following command, substituting your own source, destination, and log file paths for the bracketed values:. This command copies all contents of the source folder to the destination folder, with the following parameters:.
We recommend that you use the parameters described above when you use Robocopy to pre-seed files for DFS Replication. However, you can change some of their values or add additional parameters. For more information about Robocopy parameters, see the Robocopy command-line reference.
To avoid potential data loss when you use Robocopy to pre-seed files for DFS Replication, do not make the following changes to the recommended parameters:. After copying completes, examine the log for any errors or skipped files. Use Robocopy to copy any skipped files individually instead of recopying the entire set of files.
If files were skipped because of exclusive locks, either try copying individual files with Robocopy later, or accept that those files will require over-the-wire replication by DFS Replication during initial synchronization.
After you complete the initial copy, and use Robocopy to resolve issues with as many skipped files as possible, you will use the Get-DfsrFileHash cmdlet in Windows PowerShell or the Dfsrdiag command to validate the pre-seeded files by comparing file hashes on the source and destination servers.
Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Changing ACLs on a large number of files can have an impact on replication performance. However, when using RDC, the amount of data transferred is proportionate to the size of the ACLs, not the size of the entire file. The amount of disk traffic is still proportional to the size of the files because the files must be read to and from the staging folder.
DFS Replication does not merge files when there is a conflict. This ensures that the RPC communication across the Internet is always encrypted. RPC Technical Reference. About Remote Differential Compression.
Authentication-Level Constants. There is one update manager per replicated folder. Update managers work independently of one another. By default, a maximum of 16 four in Windows Server R2 concurrent downloads are shared among all connections and replication groups. Because connections and replication group updates are not serialized, there is no specific order in which updates are received.
If two schedules are opened, updates are generally received and installed from both connections at the same time. If the schedule is open, DFS Replication will replicate changes as it notices them. There is no way to configure a quiet time for files.
If you are using Windows Server or Windows Server R2, you can create a read-only replicated folder that replicates content through a one-way connection. Doing so can cause numerous problems including health-check topology errors, staging issues, and problems with the DFS Replication database. If you are using Windows Server or Windows Server R2, you can simulate a one-way connection by performing the following actions:. Train administrators to make changes only on the server s that you want to designate as primary servers.
Then let the changes replicate to the destination servers. Configure the share permissions on the destination servers so that end users do not have Write permissions. If no changes are allowed on the branch servers, then there is nothing to replicate back, simulating a one-way connection and keeping WAN utilization low.
If DFS Replication considers the files identical, it will not replicate them. If changed files have not been replicated, DFS Replication will automatically replicate them when configured to do so.
However, this is only a schedule override, and it does not force replication of unchanged or identical files. During initial replication, the primary member's files will always take precedence in the conflict resolution that occurs if the receiving members have different versions of files on the primary member. The primary member designation is stored in Active Directory Domain Services, and the designation is cleared after the primary member is ready to replicate, but before all members of the replication group replicate.
If the initial replication fails or the DFS Replication service restarts during the replication, the primary member sees the primary member designation in the local DFS Replication database and retries the initial replication. If the primary member's DFS Replication database is lost after clearing the primary designation in Active Directory Domain Services, but before all members of the replication group complete the initial replication, all members of the replication group fail to replicate the folder because no server is designated as the primary member.
For more information about initial replication, see Create a Replication Group. The primary member designation is used only during the initial replication process.
If you use the Dfsradmin command to specify a primary member for a replicated folder after replication is complete, DFS Replication does not designate the server as a primary member in Active Directory Domain Services.
However, if the DFS Replication database on the server subsequently suffers irreversible corruption or data loss, the server attempts to perform an initial replication as the primary member instead of recovering its data from another member of the replication group.
Essentially, the server becomes a rogue primary server, which can cause conflicts. For this reason, specify the primary member manually only if you are certain that the initial replication has irretrievably failed.
If remote differential compression RDC is enabled on the connection, inbound replication of a file larger than 64 KB that began replicating immediately prior to the schedule closing or changing to No bandwidth continues when the schedule opens or changes to something other than No bandwidth.
The replication continues from the state it was in when replication stopped. This can delay when the file is available on the receiving member. When DFS Replication detects a conflict, it uses the version of the file that was saved last. It remains there until Conflict and Deleted folder cleanup, which occurs when the Conflict and Deleted folder exceeds the configured size or DFS Replication encounters an Out of disk space error.
The Conflict and Deleted folder is not replicated, and this method of conflict resolution avoids the problem of morphed directories that was possible in FRS. This event does not require user action for the following reasons:. When a quota threshold is reached, it cleans out some of those files. There is no guarantee that conflicting files will be saved. DFS Replication does not continue to stage files outside of scheduled replication times, if the bandwidth throttling quota has been exceeded, or when connections are disabled.
DFS Replication opens files in a way that does not block users or applications from opening files in the replication folder. This method is known as "opportunistic locking.
The staging folder location is configured on the Advanced tab of the Properties dialog box for each member of a replication group. Files are staged on the sending member when the receiving member requests the file unless the file is 64 KB or smaller as shown in the following table.
Files are also staged on the receiving member as they are transferred if they are less than 64 KB in size, although you can configure this setting between 16 KB and 1 MB. If the schedule is closed, files are not staged. If any part of the file is already being transmitted, DFS Replication continues the transmission. If the file is changed before DFS Replication begins transmitting the file, then the newer version of the file is sent.
Added the Does DFS Replication continue staging files when replication is disabled by a schedule or bandwidth throttling quota, or when a connection is manually disabled? Customer questions about the previous entry, which incorrectly indicated that replicating. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Find threads, tags, and users We have servers replicated via DFS.
Comment Show 0. Current Visibility: Visible to all users. Hello, Thank you so much for posting here. It turns out this is an interesting and difficult scenario to solve for a multi-master replication system. Let's explore. Unfortunately this also means that there is often a single point of failure in the distributed locking system.
Since a central broker must be able to talk to all servers participating in file replication, this removes the ability to handle complex network topologies. Ring topologies and multi hub-and-spoke topologies are not usually possible. In a non-fully routed network, some servers may not be able to directly contact each other or a broker, and can only talk to a partner who himself can talk to another server — and so on. This is fine in a multi-master environment, but not with a brokering mechanism.
Some solutions limit the topology to a pair of servers in order to simplify their distributed locking mechanism. For larger environments this is may not be feasible. As you think further about this issue, some fundamental issues start to crop up. For example, if we have four servers with data that can be modified by users in four sites, and the WAN connection to one of them goes offline, what do we do?
The users can still access their individual servers — but should we let them? We don't want them to make changes that conflict, but we definitely want them to keep working and making our company money. If we arbitrarily block changes at that point, no users can work even though there may not actually be any conflicts happening!
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