Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. DFS Replication is a role service in Windows Server that enables you to efficiently replicate folders including those referred to by a DFS namespace path across multiple servers and sites.
DFS Replication is an efficient, multiple-master replication engine that you can use to keep folders synchronized between servers across limited bandwidth network connections. Consider using Azure File Sync to reduce your on-premises storage footprint. Azure File Sync can keep multiple Windows file servers in sync and each one only needs to keep a cache on-premises while the full copy of the data is in the cloud. Azure File Sync also has the additional benefit of cloud backup with integrated snapshots.
For more information, see Planning for an Azure File Sync deployment. RDC detects changes to the data in a file and enables DFS Replication to replicate only the changed file blocks instead of the entire file. DFS Replication is a service that runs under the local system account, so you do not need to log in as administrator to replicate.
However, you must be a domain administrator or local administrator of the affected file servers to make changes to the DFS Replication configuration. Certain scenarios are supported when replicating roaming user profiles. Windows and DFS Replication support folder paths with up to 32 thousand characters.
DFS Replication is not limited to folder paths of characters. Replication groups can span across domains within a single forest but not across different forests. The following list provides a set of scalability guidelines that have been tested by Microsoft and apply to Windows Server R2, Windows Server , and Windows Server When creating replication groups with a large number or size of files we recommend exporting a database clone and using pre-seeding techniques to minimize the duration of initial replication.
The following list provides a set of scalability guidelines that have been tested by Microsoft on Windows Server , Windows Server R2, and Windows Server There is no longer a limit to the number of replication groups, replicated folders, connections, or replication group members. Do not use DFS Replication in an environment where multiple users update or modify the same files simultaneously on different servers.
When multiple users need to modify the same files at the same time on different servers, use the file check-out feature of Windows SharePoint Services to ensure that only one user is working on a file. These objects are created when you update the Active Directory Domain Services schema.
For example, on server A, you can connect to a replication group defined in the forest with servers A and B as members. DFS Replication has its own set of monitoring and diagnostics tools.
Ultrasound and Sonar are only capable of monitoring FRS. To recover lost files, restore the files from the file system folder or shared folder using File History, the Restore previous versions command in File Explorer, or by restoring the files from backup. This script is intended only for disaster recovery and is provided AS-IS, without warranty. DFS Management has an in-box diagnostic report for the replication backlog, replication efficiency, and the number of files and folders in a given replication group.
Both show the state of replication. Propagation shows you if files are being replicated to all nodes. Backlog shows you how many files still need to replicate before two computers are in sync. The backlog count is the number of updates that a replication group member has not processed.
Although DFS Replication will work at dial-up speeds, it can get backlogged if there are large numbers of changes to replicate. DFS Replication does not perform bandwidth sensing. You can configure DFS Replication to use a limited amount of bandwidth on a per-connection basis bandwidth throttling. However, DFS Replication does not further reduce bandwidth utilization if the network interface becomes saturated, and DFS Replication can saturate the link for short periods.
As a result, various buffers in lower levels of the network stack including RPC may interfere, causing bursts of network traffic. If you configure bandwidth throttling when specifying the schedule, all connections for that replication group will use that setting for bandwidth throttling.
Bandwidth throttling can be also set as a connection-level setting using DFS Management. In DFS Replication you set the maximum bandwidth you want to use on a connection, and the service maintains that level of network usage.
Because this process relies on various buffers in lower levels of the network stack, including RPC, the replication traffic tends to travel in bursts which may at times saturate the network links. Data replicates according to the schedule you set. For example, you can set the schedule to minute intervals, seven days a week. During these intervals, replication is enabled. Replication starts soon after a file change is detected generally within seconds. The replication group schedule may be set to Universal Time Coordinate UTC while the connection schedule is set to the local time of the receiving member.
Take this into account when the replication group spans multiple time zones. Local time means the time of the member hosting the inbound connection. The displayed schedule of the inbound connection and the corresponding outbound connection reflect time zone differences when the schedule is set to local time. The disk, memory, and CPU resources used by DFS Replication depend on a number of factors, including the number and size of the files, rate of change, number of replication group members, and number of replicated folders.
In addition, some resources are harder to estimate. Applications other than DFS Replication can be hosted on the same server depending on the server configuration. However, when hosting multiple applications or server roles on a single server, it is important that you test this configuration before implementing it in a production environment.
If the connection goes down, DFS Replication will keep trying to replicate while the schedule is open. Remote differential compression RDC is a client-server protocol that can be used to efficiently update files over a limited-bandwidth network. RDC detects insertions, removals, and rearrangements of data in files, enabling DFS Replication to replicate only the changes when files are updated.
RDC is used only for files that are 64 KB or larger by default. RDC is used when the file exceeds a minimum size threshold. This size threshold is 64 KB by default. After a file exceeding that threshold has been replicated, updated versions of the file always use RDC, unless a large portion of the file is changed or RDC is disabled. To use cross-file RDC, one member of the replication connection must be running an edition of the Windows operating system that supports cross-file RDC.
The following table shows which editions of the Windows operating system support cross-file RDC. Changed portions of files are compressed before being sent for all file types except the following which are already compressed :. Compression settings for these file types are not configurable in Windows Server R2. You can turn off RDC through the property page of a given connection.
Disabling RDC can reduce CPU utilization and replication latency on fast local area network LAN links that have no bandwidth constraints or for replication groups that consist primarily of files smaller than 64 KB. If you choose to disable RDC on a connection, test the replication efficiency before and after the change to verify that you have improved replication performance. DFS uses the Windows Server file replication service to copy changes between replicated targets.
Users can modify files stored on one target, and the file replication service propagates the changes to the other designated targets. The service preserves the most recent change to a document or files. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. The set of computers participating in replication is defined by a configured topology of connections and is called a replication group.
Multiple replicated folders can be included in a replication group, with memberships selectively enabling or disabling specific replicated folders. The DFSR service uses WMI to configure server-wide parameters, while global parameters and certain replicated folder-specific parameters are configured using Active Directory.
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