The Hyper-V Failover Cluster's CSVs are put into "Redirected access" mode when recovery media is collected on the Hyper-V host that owns the CSVs

KB ID: 2058
Product: Veeam Agent for Microsoft Windows | 2.0 | 2.1 | 2.2 | 3.0.2 | 4.0 | 5.0
Published: 2015-11-12
Last Modified: 2021-08-20
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Challenge

When Recovery Media is collected for a Hyper-V host in a failover cluster, the CSVs that host owns may enter "Redirected access" mode.

The System event log will list 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)

Cause

During the Collecting recovery media files stage of a Veeam Agent for Microsoft Windows backup job, the Cluster Shared Volume detects that the WIMMount driver has become active on the device stack and puts the CSVs into "Redirected access" mode while WIMMount is active. While the "Redirected access" mode is enabled, the CSV performance may degrade.

 

Solution

The following workarounds are available:

Option A: Reboot the Hyper-V host

Manually reboot the Hyper-V host after the Recovery Media creation completes to stop the WIMMount driver.

Option B: Stop WIMMount manually.

WARNING: Stopping WIMMount manually may lead to unexpected results.

To manually stop the WIMMount execute the following command:

sc stop wimmount
Direct IO will resume after a while.
 

Option C: Disable automatic Recovery Media collection

To disable Recovery media collection, create the following registry value on the machine where Veeam Agent for Microsoft Windows is installed:

Key Location: HKLM\SOFTWARE\Veeam\Veeam Endpoint Backup
Value Name: DisableRECollection 
Value Type: DWORD (32-bit) Value
Value Data: 1

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