Backing up Hyper-V VMs using "wbadmin" failing on Windows Server 2012

Question

I'm trying to backup a single VM using "wbdamin".

I'm using this command-line:

wbadmin start backup -backupTarget:d: -hyperv:VM_Machine_Name -quiet

But the backup have no success. Looking at my Events, I get the following information:

Source: SSP

Event ID: 16387

Level: Error

"Writer Microsoft Hyper-V VSS Writer experienced some error during snapshot creation. More info: ."

=============================

Source: Backup

Event ID: 521

Level: Error

"The backup operation that started at '‎2014‎-‎06‎-‎11T15:38:44.459000000Z' has failed because the Volume Shadow Copy Service operation to create a shadow copy of the volumes being backed up failed with following error code '0x8100010C'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved."

=============================

Source: VSS 

No Event Errors.

I didn't find any info about "0x8100010C" error code through the web and I'm stuck. Anyone know how to fix this?

Solution

I also got the same error code: 0x8100010C yesterday.

Later I found it seemingly happened because I tried to put the backup to the same partition where the VM's VHDX file resided -- looks hyper-v doesn't allow this, but the error code is really so obscure

Hope this helps.

Comments

[DanBig]

Are you using an elevated command prompt?

[TomTom]

Is that failure any different from the one documented all over the internet and ad microsoft and just available from google when you type "vss error 0x8100010C"? Is it repeatable? High IO load scenario so VSS may time out?