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Saturday, April 28, 2012

DPM Agent Reported Unavailable or Initial Replica Creation Stuck

 

Scenario:-

1. DPM agent installed on protected server running Windows Server 2008 R2 SP1

2. Agent reported Unavailable, However backup time occur, backup is successful.

3. Manual refresh the agent, status reported OK

4. Another scenario is when create initial replica. Data transfer is maintained at 0.19MB or small value. After 30 minute, the initial replica is still remain at small value without any changes.

Resolution:-

Disable TCP Chimney and RSS on Windows Server 2008

netsh int tcp set global chimney=disabled
netsh int tcp set global rss=disabled

Disable TCP Chimney and RSS on Windows Server 2003

Disable TCP Chimney:-
netsh int ip set chimney DISABLED

Disable RSS:
Modify the registry
  1. Click Start, click Run, type regedit, and then click OK.
  2. Locate and then click the following registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

  3. On the Edit menu, point to New, click DWORD Value, and then type EnableRSS.
  4. Double-click EnableRSS, type 0, and then click OK.
  5. Restart the computer on which you changed the EnableRSS value

View the status

netsh int tcp show global

image

Then modify Network connection, type the following command:

ncpa.cpl

Modify the properties of the backup NIC. Set to None / Disable on the Checksum Offload/LargeSend Offload and RSS

image

Once the above complete, the agent status reported OK and initial replica creation completed without any issue.

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