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Microsoft DFS Issues

 

A database problem is blocking replication on volume

Browsing DFS gradually slows


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DFS is not working anymore
Microsoft DFSR Case Collections
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DFS Replication just stops
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Microsoft DFS troubleshooting tips

PDF files are not replicated between two DFS

RPC Server Unavailable when trying to Show Root in DFS
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This server already hosts a DFS root


Tow users open the same file in DFS may has a problem

Very slow DFSR on Windows Server 2008
What tools do I use to manage DFS namespaces?
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Windows 2008 DFS - Random slow browsing
Windows Server 2008 R2 loses ability to connect to network

 

Windows 2008 DFSR doesn't work anymore

 

Situation: The clients is running 2 Windows 2008 DCs on 2 sites. The DFSR has been working, but doesn't work any more. Here are the details:

" DFS between 2 offices

ServerB (25Mb/5Mb)

ServerC (T1 4.5Mb/1.5Mb).

I have several folders created and just discovered inconsistency as follows.

I was logged in to B Site and both drives "\\ServerB\shared" and "\\c\shared" had the same folder/file structure.

However when I opened "\\ServerC\d$\shared" - at least 1 folder was missing.

DFS is scheduled to run at full speed from 9pm - 5am and 26Kb during work hours but it has been turned off.

I had to manually synchronize it so people could work on the files. Most of the documents are PPT files 100MB-200MB in size, when replication was running during day, PPT docs could not be saved numerous times. for example.

1. 100MB PPT is opened and modified

2. PPT is saved

3. more modifications were made

4. Could not be saved.

I believe it was due to real time replication, however the missing folder/different view is something I have not seen yet".

We found the following event:

In ServerB we have this Event

Source: DFSR

Event ID: 6804

Description:The DFS Replication service has detected that no connections are configured for replication group shared. No data is being replicated for this replication group.

Additional Information:

Replication Group ID: A0817382-BA92-44CE-AB71-630E3064645D

Member ID: B3C98C27-CC54-4720-869E-2E24F08940C3


In the ServerC We have this event

Event ID: 4102

Description:The DFS Replication service initialized the replicated folder at local path D:\shared and is waiting to perform initial replication. The replicated folder will remain in this state until it has received replicated data, directly or indirectly, from the designated primary member.

Additional Information:

Replicated Folder Name: shared

Replicated Folder ID: AD4472C1-1283-491F-AD0D-D9E571F79BB5

Replication Group Name: shared

Replication Group ID: A0817382-BA92-44CE-AB71-630E3064645D

Member ID: 16D89D05-4533-4FD6-B2AF-1741ECA0309C


In the debug (C:windows\debug), we found some errors as shown below: 20100728 21:51:02.961 2804 INCO 7487 InConnection::RestartSession Retrying establish contentset session. connId:{D61C841B-C9F4-4247-B58B-4B9015256C91} csId:{AD4472C1-1283-491F-AD0D-D9E571F79BB5} csName:shared


20100728 21:51:02.961 2804 INCO 1042 [WARN] SessionTask::Step (Ignored) Failed, should have already been processed. Error:

 

Troubleshooting: 1. Disable TCP off loading on all DFSR replications partners.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
Value =DisableTaskOffload
Type = DWORD
Data = 1

Value =EnableTCPChimney
Type = DWORD
Data = 0

Value =EnableTCPA
Type = DWORD
Data = 0

Value =EnableRSS
Type = DWORD
Data = 0
Then reboot the server

After the reboot, both DCs get following Event:

Event ID: 4202

Description: The DFS Replication service has detected that the staging space in use for the replicated folder at local path D:\SHARED is above the high watermark. The service will attempt to delete the oldest staging files. Performance may be affected.

Additional Information:
Staging Folder: D:\SHARED\DfsrPrivate\Staging\ContentSet{AD4472C1-1283-491F-AD0D-D9E571F79BB5}-{B3C98C27-CC54-4720-869E-2E24F08940C3}
Configured Size: 4096 MB
Space in Use: 3730 MB
High Watermark: 90%

Low Watermark: 60%

Replicated Folder Name: shared
Replicated Folder ID: AD4472C1-1283-491F-AD0D-D9E571F79BB5
Replication Group Name:shared
Replication Group ID: A0817382-BA92-44CE-AB71-630E3064645D
Member ID: B3C98C27-CC54-4720-869E-2E24F08940C3

2. Increase the size of the staging area by following this page: How to Edit the Quota Size of the Staging Folder

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