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Very slow DFSR on Windows Server 2008

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Very slow DFSR on Windows Server 2008

Postby guest » Thu Jul 29, 2010 11:40 am

We need to have distributed file system between two location.
I evaluating possibility to use DFS and two Windows Server 2008 to do it.

I set up two computer with clean installation of system.
The test is on two local subnets, so speed should not be an issue.
Each server is defined in separate logical site.

The DFSR folder I create on one server has 50 GB / 40,000 files.
The initial replication still is not finished after couple of days.
The transfer speed is only about 5kB/s and 3 files / min.
I increase staging quote to 100GB, so it should not be a limit.

I also make simple test of speed between both servers.
I create shared folder on both servers and manually copy files.
The transfer speed is reasonable 5 MB/s (1000 time faster that DFSR).

There is no processor load on servers (0% CPU).
This is test before real use so server do almost nothing else.
The event log shows sometimes 5014 but followed immediately with 5004.

Does anybody have an idea what is wrong?
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Re: Very slow DFSR on Windows Server 2008

Postby guest » Thu Jul 29, 2010 11:40 am

I don't know if you've tried all these tips listed here, but I'll include them anyway:

1. Missing Windows Server 2003 Network QFE Hotfixes or Service Pack 2 (Not applicable in your case)
2. Missing DFSR Service’s latest binary
3. Out-of-date Network Card and Storage drivers
4. DFSR Staging directory is too small for the amount of data being modified
5. Bandwidth Throttling or Schedule windows are too aggressive
6. Large amounts of sharing violations
7. RDC has been disabled over a WAN link. (Not applicable again given your scenario)
8. Incompatible Anti-Virus software or other file system filter drivers
9. File Server Resource Manager (FSRM) configured with quotas/screens that block replication.
10. Un-staged or improperly pre-staged data leading to slow initial replication.


http://blogs.technet.com/askds/archive/2007/10/05/top-10-common-causes-of-slow-replication-with-dfsr.aspx

Also check link-negotiation settings on the NICs/switches and make sure they're consistent; full-duplex or auto.
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Re: Very slow DFSR on Windows Server 2008

Postby guest » Thu Jul 29, 2010 11:42 am

Yes, I've looked at this list before I post here.

ad 1) N/A
ad 2) The Windows Server 2008 Standard is with SP1 and have all latest updates installed.
ad 3) I installed both servers two weeks ago and allow to download all available updates.
Network cards is Broadcom NetXtreme 57xx Gigabit, chipset Intel 925X
ad 4) I increase staging limit to 100GB (what is more than whole folder I replicate)
ad 5) No throttling or schedule (set to run all the time with full bandwidth)
ad 6) It is test so folder is rarely used at all, even as I set couple access accounts
ad 7) N/A
ad 8) Not installed
ad 9) Not installed
ad 10) I do not pre-stage data to second server.
ad NIC) all are auto

regarding 3 & NIC)
I assume that problems there will effect all communication not only DFSR and file coping test run well.
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Re: Very slow DFSR on Windows Server 2008

Postby guest » Thu Jul 29, 2010 11:42 am

Hi Michal88,

Based on the experience, TCP off loading on the network level may be causing the issue.


Please add these following registry values to all DFSR replications partners to see it can be helpful.


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


Please note: You will need to reboot the server for these changes to take into effect.


After the reboot monitor replication for the ammount of time to see if the issue can be resolved.


Hope it helps.

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Re: Very slow DFSR on Windows Server 2008

Postby guest » Thu Jul 29, 2010 11:43 am

Hi David,

You are right, the problem was with TCP off loading.
Replication now work perfectly.
Thank you for help.
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