VSS Snapshot Creation Delay on Server with DFSR Enabled
Challenge
When backing up a server with the DFS feature enabled, the Veeam Agent backup job's VSS snapshot creation step can take multiple hours or days to complete.
Cause
During the VSS preparation phase, the Veeam Agent prepares VSS writers for a snapshot. In the case of the DFS VSS writer, the Veeam Agent gets into a recursion while checking the files in the scope of the DFS writer. This recursion can significantly impact performance.
Solution
To exclude the DFS writer from the preparation phase, add the following registry key to the server where Veeam Agent for Microsoft Windows is installed:
- Key Location: HKLM\SOFTWARE\Veeam\Veeam Endpoint Backup\
- Value Name: VSSExcludeDFSWriter
- Value Type: DWORD (32-Bit) Value
- Value Data: 1
Set registry value using PowerShell:
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