I am the IT Director at our school. We were having DFS replication issues replication simply was not happening , so I deleted the namespace entirely, then rebuilt the namespace. There is still no replication going on! Each site has a domain controller running R2. There servers where the namespace resides were initially running R2 before problems began, but I now have them all on Make sure ports are allowed?
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Learn about trends and get answers to your biggest Citrix questions! Listen Now. The majority of DFSR issues arise because of active directory replication issues, inadequate staging quota, sharing violations of open files, a corrupted DFSR database, unexpected dirty database shutdowns, conflicting data modifications, and accidental data deletion.
The end result of the above is high backlog activity and out of sync replicated folders and finally DFSR data replication failures or data loss in case of accidental data deletion. Scenario 1 :. I created a new replication group, added a local site server and a remote site server in that group.
Even after a few hours replication initial sync had not even started. The remote site does have an additional domain controller. The possible reason could be active directory replication failure to the remote site. Whenever we create a DFS namespace and DFS Replication group, the namespace and replicated group are stored into the active directory domain partition and if AD replication is failing, then the changes are not replicated to the remote domain controller, hence the DFS server in that site could not get those changes and could not initialize initial sync one way sync.
The command will poll changes from active directory. Even after forcing replication, if the DFSR initial sync sill did not start, then there must be some issue with AD replication and you need to troubleshoot further. The DFSR trigger event as shown below;. The above event informs us that at least DFS replicated folder replication was triggered now. We need to wait until DFSR finishes replicating all data from the primary member and triggers an event ID which means initial sync is completed and now both servers can replicate data authoritatively.
Note — fixing AD replication is not in the scope of this document. Scenario 2 :. After creating a DFSR replicated group, one-way sync is triggered by the primary member to secondary members. Replication is very slow with latency or almost getting stopped and the backlog is noticeably increased from the source to the destination server. Event ID: , , , , are logged on either source and destination or both servers which are indicators of low staging quota issue.
Event ID: and Severity: Warning and informational. With DFSR tells that staging space is used above watermark and with tells that old staging files are successfully deleted from staging area. Event ID: and Severity: Warning. Event states that DFSR failed to cleanup staging area and event states that staging area is almost full.
The indicates that dfsr cannot replicate since staging area is inaccessible. The source server replicates the file to the destination server staging, however, the file get purged as part of staging cleanup process before the file can be moved into the Replicated Folder.
The purged file now needs to be replicated from the source server again. Note that for the initial sync process the maximum staging area is required, once the process has finished successfully its utilization is limited to data being changed at both sides, so we can set it to a lower value to save disk space.
You may look at the blog post below to get a tentative size of staging quota. Scenario 3 :. DFSR cannot replicate the open files if files are left open or files remain in use, or if file handles did not close at the source or destination due to sharing violations. It creates a high backlog and causes replication to become slow. DFSR needs to wait until files get closed, else we can clear any open sessions on the server from share management, but it's not recommended as data loss may occur.
Avoid replicating roaming profile shares and the user's PST stored on network shares. Scenario DFSR database corruption or internal error caused replication failed.
Source: DFSR. Event ID This can occur if the service terminated abnormally due to a power loss, for example or an error occurred on the volume. The service has automatically initiated a recovery process. The service will rebuild the database if it determines it cannot reliably recover.
No user action is required. DFSR replication gets halted on specific member with below event. Category: None. Event ID: Type: Error. Replication has been stopped for all replicated folders on this volume. Additional Information:. Error: The database is corrupt Error: Internal database error The Backlog can reach up to a few lakhs files.
In this case, data replication gets stopped back and forth on the affected member. To resolve this issue, the DFSR database needs to be rebuilt on the affected server. Steps are given below. Log on to the DFSR server where data is not replicating and if space is available, locate the affected replicated group and open group properties to increase the staging area on the staging tab to maximum affordable value.
If you have already increased staging area previously, ignore this step. If you have added any data on the affected member under the replicated folder after replication failure, copy that specific data or entire folder if you are not sure to the other location as during the rebuilding process, that data will get moved to a pre-existing folder under the DFSR folder.
In our case, userdata is the actual replicated folder and system volume information is the folder where the DFSR database is stored. This folder is a system folder and remains hidden by default. Only a system account has full control on this folder. You cannot open this folder unless you take ownership of this folder.
Take ownership of this folder and grant the built-in administrators group full control on this folder. We need to delete the entire DFSR folder. For that command line tools must be utilized. But it may be possible that command fails to remove the folder and its contents, at least the command fails on my lab servers.
Hence I used a freeware open source utility named SuperDelete to achieve the result. The utility works great all the time. This process again creates a DFSR directory under system volume information with the database and triggered Initial replication oneway sync , any new files copied in this folder after replication failure get moved to the pre-existing folder under DFSR.
This Initial sync process can take a significant amount of time depending upon the data size. Since the data already exists in the replicated folder, some time will still be required for data staging, building hash and store in the DFSR database. Once Initial replication completed, DFSR logs event ID which states that all data is synced and data can be replicated back and forth now.
To resolve this issue, back up the files in the affected replicated folders, and then use the ResumeReplication WMI method to resume replication. Volume: D:. Recovery Steps. Back up the files in all replicated folders on the volume. Failure to do so may result in data loss due to unexpected conflict resolution during the recovery of the replicated folders. For example, from an elevated command prompt, type the following command:. DFSR Event ID is triggered after a dirty shutdown which provides commands to resume the specified replicated group manually.
Dirty shutdowns can happen if a server has rebooted unexpectedly or got BSOD or if hard drive level corruption occurs. This is the default behaviour with the server. Else it may result in data loss from unexpected conflict resolution during the recovery of the replicated folders.
For example:. If the replication resumed successfully, DFSR logs event ID , and finally on the affected member as shown below. Side Note :. The reason Microsoft has stopped auto recovery after DFSR dirty shutdown is that during the auto recovery function, the DFSR member may have lost the replicated folder along with data.
This is the kind of bug discovered with R2 servers and hence, they have introduced new a hotfix with R2 KB After installing this hotfix, new registry items get set on the server. Type: Dword. Data: 1. With this registry set, there is no auto recovery for DFSR dirty shutdown databases and they must resume replication manually.
The behaviour is made as default on Windows Server We must copy the replicated folder before resuming the replicated folder to avoid any data loss that may occur and then run the command to resume replication as mentioned above. After Microsoft found a fix for the actual issue, they have released hotfix KB for R2 and included it in OS default media. The hotfix resolved the data deletion issue during DFSR a database auto recovery process.
Then you must manually resume replication with the above command. The issue is sorted out permanently. Note that accidental data deletion from a two way DFSR replicated folder is not a technical issue, its default by design behaviour.
Since DFSR is a multi master replication technology, all members of the replicated folder once converged are considered as primary members and authoritative for any action taken on data and if data is deleted on one member, deletion gets replicated to all members and data loss occurs.
Restoring data from backup is the only solution in that case.
Microsoft DFSR Issues and Resolution
Skip to main content. Select Product Version. All Products. The affected domain controller was recently promoted.
Windows Server – Fehlerbehebung für DFS-Replikationssynchronisierung (Non-SYSVOL-Replikatgruppen)
I am having problem with DFSR file replication basically I have five servers that are not receiving files. My name space servers are running Windows Server the problem-ed servers are all running Windows Server After removing the bad entries via ADSI edit than doing a dfsrdiag poll the correct config was picked up. So now I would like to ask does anyone know how to troubleshoot dfs when nothing is replicating? Please remember to mark the replies as answers if they help. If you have feedback for TechNet Subscriber Support, contact tnmff microsoft. As I stated the servers are all running Windows server
DFS Replication: How to troubleshoot missing SYSVOL and Netlogon shares
Open a PowerShell command and run the following cmdlet. If you are running FRS yet, you should get a warning that the migration has not been started yet. If it exists, it means you are already replicating using DFSR. Method 3. You may notice "File Replication Service" service running under services snap-in. This service will be disabled once the migration is complete.