Hello,

protecting one of my file servers I always getting the following error:

The replica of F:\ on xxx is inconsistent with the protected data source. All protection activities for data source will fail until the replica is synchronized with consistency check. (ID: 3106)

DPM has detected a checksum mismatch during data transfer over the network (ID: 30087)

I have protected drive E: of the same server without any problems.

I have tried to run a consistency check several times, with no success.

Any idea, how to troubleshoot this error?

• Edited by Guido Peter Wednesday, October 15, 2014 9:56 AM

Hi,

 I would suggest checking the current SNP features on the DPM server and problem server ensuring Chimney offload and RSS are disabled. If you identify Chimney offload and RSS as enabled I would test behavior of backup for the problem volume with both features disabled on DPM server and problem server.

To determine the current status of SNP features 

From command prompt issue netsh int tcp show global

To configure TCP Chimney Offload (Chimney Offload State) in the operating system

-To enable chimney:   netsh int tcp set global chimney=enabled

-To disable chimney:   netsh int tcp set global chimney=disabled

 

 

To configure RSS (Receive-Side Scaling State) in the operating system

-To enable RSS:    netsh int tcp set global rss=enabled

-To disable RSS:     netsh int tcp set global rss=disabled

Information about the TCP Chimney Offload, Receive Side Scaling, and Network Direct Memory Access features in Windows Server 2008: http://support.microsoft.com/default.aspx?scid=kb;EN-US;951037

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Could you please also try enabling on-the-wire compression under the Optimize performance for that PG and see if that makes any difference.

Hi,

I have configured SNP as you suggested, but I had no success. I have tried to start a backup for this drive local on the server, no success. Error message: "Backup of volume F: has failed. The specified backup disk cannot be found."

After changing the "Maximum size:" to "No limit" in shadow copies, settings, for this drive, I was able to run a local backup.

But consistency check is still not successful.

Hi,

I have configured SNP as you suggested, but I had no success. I have tried to start a backup for this drive local on the server, no success. Error message: "Backup of volume F: has failed. The specified backup disk cannot be found."

After changing the "Maximum size:" to "No limit" in shadow copies, settings, for this drive, I was able to run a local backup.

But consistency check is still not successful.

 Did you ever have any luck fixing this?  I have run into a similar issue and and had absolutely no success fixing it.  I have other backups for the same server working fine, but not this one.  I also have a number of other servers and backups outright failing as well.

I had the same problem , disabled everything about checksum on ethernet adapter , etc and nothing fixed the problem. 

So , I ended up disabling the checksum data on DPM server and the problem is gone . Tested the backup later on and everything looks good . So , if you want to disable the checksum data on DPM server , do it by your own risk please . Make sure that you use DPM powershell :

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

True

PS>Set-DPMGlobalProperty -DPMServerName server.domain.com -IsNetworkChecksumRequired 0

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

False

Restart the server and retry the job .

• Edited by TuxGB 2 hours 41 minutes ago

Hi,

I have configured SNP as you suggested, but I had no success. I have tried to start a backup for this drive local on the server, no success. Error message: "Backup of volume F: has failed. The specified backup disk cannot be found."

After changing the "Maximum size:" to "No limit" in shadow copies, settings, for this drive, I was able to run a local backup.

But consistency check is still not successful.

 Did you ever have any luck fixing this?  I have run into a similar issue and and had absolutely no success fixing it.  I have other backups for the same server working fine, but not this one.  I also have a number of other servers and backups outright failing as well.

Try disabling the checksum data on DPM server .

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

True

PS>Set-DPMGlobalProperty -DPMServerName server.domain.com -IsNetworkChecksumRequired 0

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

False

Restart the server and retry the job .

• Edited by TuxGB 2 hours 43 minutes ago

I had the same problem , disabled everything about checksum on ethernet adapter , etc and nothing fixed the problem. 

So , I ended up disabling the checksum data on DPM server and the problem is gone . Tested the backup later on and everything looks good . So , if you want to disable the checksum data on DPM server , do it by your own risk please . Make sure that you use DPM powershell :

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

True

PS>Set-DPMGlobalProperty -DPMServerName server.domain.com -IsNetworkChecksumRequired 0

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

False

Restart the server and retry the job .

• Edited by TuxGB Thursday, July 09, 2015 5:00 AM

Hi,

I have configured SNP as you suggested, but I had no success. I have tried to start a backup for this drive local on the server, no success. Error message: "Backup of volume F: has failed. The specified backup disk cannot be found."

After changing the "Maximum size:" to "No limit" in shadow copies, settings, for this drive, I was able to run a local backup.

But consistency check is still not successful.

 Did you ever have any luck fixing this?  I have run into a similar issue and and had absolutely no success fixing it.  I have other backups for the same server working fine, but not this one.  I also have a number of other servers and backups outright failing as well.

Try disabling the checksum data on DPM server .

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

True

PS>Set-DPMGlobalProperty -DPMServerName server.domain.com -IsNetworkChecksumRequired 0

PS>Get-DPMGlobalProperty -DPMServerName  server.domain.com IsNetworkChecksumRequired

False

Restart the server and retry the job .

• Edited by TuxGB Thursday, July 09, 2015 4:59 AM