Knowledge Article 117515

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  • Title

    Repairing an Agent with a Transfer Error
  • Description

    You are unable to back up an agent, receiving the following error.

    Transfer error The transfer of one or more volume images from a protected machine to the Core failed:

    •Volume transfer failed: Transfer failed for volume ‘C:\’

    ◦Volume transfer network error: Agent dropped the network connection during data transfer. Check the agent log for possible errors.

    StackTrace:

    System.AggregateException: One or more errors occurred. —> Replay.Core.Contracts.Transfer.CoreTransferFailedException: The transfer of one or more volume images from a protected machine to the Core failed —> System.AggregateException: One or more errors occurred. —> Replay.Core.Contracts.Transfer.CoreVolumeTransferFailedException: Transfer failed for volume ‘C:\’ —> System.AggregateException: One or more errors occurred. —> Replay.Core.Contracts.Transfer.CoreVolumeTransferNetworkErrorException: Agent dropped the network connection during data transfer. Check the agent log for possible errors.

  • Resolution

    There are two potential solutions to this issue.

    Solution 1
    1. On the Agent Machine go to Configuration tab and select  Transfer Settings.
    2. Set the following options:
      1. Network Read Timeout. 10 minutes
      2. Network Write Timeout. 10 minutes
      3. Maximum Segment Size. 1048576
      4. Maximum Transfer Queue Depth. 48 (24, 16, 12 are also possibilities)
    3. On the Core machine, go to the Configuration tab and select Settings, then select Client Timeout Settings.
    4. Set the connection timeout to 10 minutes.
    5. Create shadow copies for all protected volumes on the agent machine and verify if all shadow copies were created successfully.
    6. Verify the network connection speed and percentage of lost packages.
    7. Check the number of fragmented files on the protected volume. Defragment if needed.
    8. The issue could also be caused by problems receiving metadata on the agent. Run checkdisk with the key/F to fix this issue.
      1. NOTE: F is the driver letter for the disk on which the transfer job fails.
      2. NOTE: A base image will be forced after you perform this step.
    9. On the Core UI, select the Machines tab.
    10. Select the affected agent.
    11. Select Protect. The Protection window should appear.
    12. Enter the proper credentials and click Protect.
    13. A window should appear asking if you would like to repair the agent. Click Yes.
    14. Force a snapshot.
    Solution 2
    1. Remove the shadow copies on the C:\.
    2. Set to no limit.
    3. Start a new snapshot.
    4. If this does not work, run the following command:
      1. vssadmin add shadowstorage /For=C: /On=(other volume; not C): /Maxsize=unbounded
    5. Force a snapshot.

Product(s):
AppAssure
5.3.7, 5.3.6, 5.3.5, 5.3.4, 5.3.3, 5.3.2, 5.3.1, 5.3, 5.2, 5.1, 5.0

Topic(s):
Technical Solutions

Article History:
Created on: 12/18/2013
Last Update on: 2/22/2014

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