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CSV volumes are put into "Redirected access" mode when a recovery media is created on the CSV owner Hyper-V host in Microsoft Failover Cluster

KB ID: 2058
Product: Veeam Agent for Microsoft Windows
Version: 1.x, 2.x
Published: 2015-11-12
Last Modified: 2020-08-13


If Recovery Media is created on a CSV owner Hyper-V host, all CSV's that it owns will be put into "Redirected access" mode. The System event log will show the following event: 
Event ID = 5125, Failover Clustering:
Cluster Shared Volume 'VolumeX' ('VolumeX') has identified one or more active filter drivers on this device stack that could interfere with CSV operations. I/O access will be redirected to the storage device over the network through another Cluster node. This may result in degraded performance. Please contact the filter driver vendor to verify interoperability with Cluster Shared Volumes. 
Active filter drivers found:
WIMMount (HSM)


The Cluster Shared Volume detects that the WIMMount driver has become active on the device stack, and the CVS is put into "Redirected access" mode while WIMMount is active. While "Redirected access" mode is enabled, the CSV performance may degrade.


The following workarounds are available.
  1. Reboot the Hyper-V host after the Recovery Media creation to disable the WIMMount driver.
  2. Stop WIMMount manually.
WARNING: stopping WIMMount manually may lead to unexpected results.

If you wish to stop the WIMMount driver manually, run the Command Prompt as Administrator and execute the following command: 

sc stop wimmount
You should see a similar output.
SERVICE_NAME: wimmount
        TYPE               : 2  FILE_SYSTEM_DRIVER
        STATE              : 1  STOPPED
        WIN32_EXIT_CODE    : 0  (0x0)
        SERVICE_EXIT_CODE  : 0  (0x0)
        CHECKPOINT         : 0x0
        WAIT_HINT          : 0x0

Direct IO will resume after a while.

More information

If you have further questions, open a support case as follows:

  1. Right-click the Veeam Endpoint Backup / Veeam Agent for Windows icon in the system tray and select Control Panel.
  2. Click the Support link at the top of the window.
  3. Click Technical Support to submit a support case to the Veeam Support Team directly from the product.
KB ID: 2058
Product: Veeam Agent for Microsoft Windows
Version: 1.x, 2.x
Published: 2015-11-12
Last Modified: 2020-08-13

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