Avamar: Windows VSS backup failing with - ERROR: Win32 call L"GetVolumePathNameW" failed

Summary: Volume Shadow Copy Service (VSS) backup for Windows failing with error: ERROR: Win32 call L"GetVolumePathNameW" failed and avvss Error <12077>: VSS returned an error message exiting HR = 0x8007007b ...

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Symptoms

Windows VSS backup fails with the following error:

avvss Error <8801>:
ERROR: Win32 call L"GetVolumePathNameW" failed.
avvss Error <12077>: VSS returned an error message exiting HR = 0x8007007b

 

Cause

The error is due to a code issue that causes the avtar binary to treat volume paths like "\\globalroot\\device\\harddiskvolume1." This volume path is seen as a mount point rather than a partition path.

 

Resolution

To resolve this issue.

  • Upgrade the Avamar Server to.
    • 19.4.100-124 or later
  • The fix is in Avamar 19.4 and later software releases.

 

Additional Information

Also read to the following KB:

 

Affected Products

Avamar

Products

Avamar, Avamar Client, Avamar Client for Windows, Avamar Server
Article Properties
Article Number: 000063946
Article Type: Solution
Last Modified: 19 May 2025
Version:  7
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