Failed to open raw hard disk data file
Hello,
Since few days I have got an error message when I am trying to backup hyper-v disks:
1 Information 1/8/2014 9:21:27 PM Priority changed to Low.
2 Information 1/8/2014 9:21:28 PM Accessing VHD file snapshot 'D:\VHD512ABX.vhd'...
3 Information 1/8/2014 9:21:28 PM Attempting to create a multi-volume snapshot.
4 Information 1/8/2014 9:21:28 PM Adding 'E:\ProgramData\Microsoft\Windows\Hyper-V' to multi-volume snapshot...
5 Information 1/8/2014 9:21:28 PM Adding 'E:\ProgramData\Microsoft\Windows\Hyper-V' to multi-volume snapshot...
6 Information 1/8/2014 9:21:28 PM Adding 'D:\VHD512ABX.vhd' to multi-volume snapshot...
7 Information 1/8/2014 9:21:28 PM Setting up the 'use VSS' option...
8 Information 1/8/2014 9:21:28 PM VSS component is included in the multi-volume snapshot: [writer class='66842CD4-6DED-4F4B-8F17-FD23F8DDC3DE', writer instance='00000000-0000-0000-0000-000000000000', component name='FCD2B8FE-7F9B-4C01-A028-0795F4614812'].
9 Error 1/8/2014 9:21:35 PM Failed to open raw hard disk data file 'D:\VHD512ABX.vhd'.
Additional info:
--------------------
Error code: 94
Module: 83
LineInfo: 383ffdb092990da7
Fields:
Message: Failed to open raw hard disk data file 'D:\VHD512ABX.vhd'.
--------------------
Error code: 64
Module: 83
LineInfo: 383ffdb092990d4f
Fields:
Message: An internal error.
--------------------
Error code: 33
Module: 7
LineInfo: e24f93d0b8d8c9c3
Fields:
Message: Unable to create volume snapshot
--------------------
Error code: 50242
Module: 16
LineInfo: 14181c22ef45b04e
Fields:
Message: Failed to start creating the volume snapshot.
--------------------
Error code: 9
Module: 0
LineInfo: 2aacb7b2ab852ac
Fields: code : 2147754767
Message: Unknown status.
--------------------
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8bc
Fields: code : 2147754767
Message: Unknown Win32 error
--------------------
10 Error 1/8/2014 9:21:35 PM Source is not selected. The operation has been terminated.
Task 'ISA-VMSV-01 - Incremental backup' has failed on machine 'ABX-XY.corp.abc.com'.
Does anybody know, how I can solve the problem? Many thanks

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Hello Noel,
Thank you for your posting! First of all, please make sure your virtual disks are supported for the quiesced snapshot. Then check as discribed in this article if there are old snapshots and disks left after the previous failure and delete them. Verfy that the quiesced snapshot works correctly in the vSphere:
- Open the vSphere connection to the ESX host.
- Right click on the machine > take snapshot > check the "Quiesce guest file system"
- Uncheck the "Snapshot the virtual machine's memory" and click OK.
For more information please refer to the following article.
Thank you,
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