Error Message

Job Log reports :

Backup- VRTSRV::\\\Hyper-V?Virtual?Machine\Virtual_Machine 
V-79-57344-38721 - Failed to mount one or more virtual disk images.
 

Additional Errors Reported:

Final error: 0xe000e369 - Backup job failed because one or more disks cannot access its parent disk.
Final error category: System Errors
For additional information regarding this error refer to link  V-79-57344-58217

Backup - VRTSRV::\\\Hyper-V?Virtual?Machine\Virtual_Machine
V-79-57344-58217 - Backup job failed for disk 'F\VMs\Virtual_Machine\Virtual Hard Disks\.vhdx' because one or more disks cannot access its parent disk.

Verify - \\\Hyper-V?Virtual?Machine\Virtual_Machine\.vhdx
Data for .vhdx is corrupt.
Difference encountered in file data.

The file .vhdx is different.

V-79-57344-38704 - Backup Exec cannot read the file '.vhdx '. The read operation failed with the following error: 'The handle is invalid.' (0x00000006). 
Refer to the Backup Exec log files for more information.

Data for VRTSRV::VRTSRV::\\\Hyper-V?Virtual?Machine\Virtual_Machine\.vhdx is corrupt.

Backup Exec Debug: Always on Debug Log Hyper-V host (C:\Program Files\Veritas\Backup Exec\Logs) or (C:\Program Files\Veritas\Backup Exec\RAWS\Logs)

BEREMOTE: bevs::IVhdFileUtil::open_VHD:1603: ReadFile failed bytesRead 0 for disk 
BEREMOTE: bevs::IVhdFileUtil::load_VHD_structures: failed to read footer data, offset: 0x405798400, error: 0

BEREMOTE: bevs::IVhdFileUtil::load_VHD_structures: failed to read footer data, error: 0
BEREMOTE: bevs::IVhdFileUtil::load_VHD_structures: failed to read footer data, error: 0
BEREMOTE: [fsys\ntfs]          | Error mounting disk(s): E_IMG_FS_FAILED_TO_MOUNT_VIRTUAL_DISK (0xe0009741).

Media Server Debug Log: Always on Debug Log Hyper-V host (C:\Program Files\Veritas\Backup Exec\Logs)
                   - 
BENGINE: Unable to open file: \\?\UNC\.pdvfs\\2\BEData\STHVHD\IMG000001\F\VMs\Virtual_Machine\Virtual Hard Disks\.vhdx
CreateFileW failed, lastError = 00000003, The system cannot find the path specified.
EndDriverSessionThread:SetEvent-ShutDownRequest failed, lastError = 00000006, The handle is invalid

This issue may be observed due to excessive IO activity on the Backup Exec Server. 

Create the following registry key on the Hyper-V server :

.

Registry Path : HKEY_LOCAL_MACHINE\SOFTWARE\Veritas\Backup Exec For Windows\Backup Exec\Engine\HyperV Agent 
DWORD : DisableOverlappedIO 
Value : 1 

Restart the remote agent service on the Hyper-V server and re-run the backup job. 

Warning: Incorrect use of the Windows registry editor may prevent the operating system from functioning properly. Great care should be taken when making changes to a Windows registry. Registry modifications should only be carried-out by persons experienced in the use of the registry editor application. It is recommended that a complete backup of the registry and workstation be made prior to making any registry change