Ensure you run chkdsk from an elevated command prompt (run as administrator).  You may need to do what the error message is saying to run in maintenance mode

You can try to temporally disable the snapshot schedule.

Although depreciated, you can also try the PowerShell cmdlet

Repair-ClusterSharedVolume -ChkDsk –Parameters

You don't need to log into the vss-control volume and there is no risk in having the vss-control volume connected.  VSS-Control is a gateway to pass info to/from the array.  It's not a "system" volume.

-Joe

Hi guys, thanks for replying.

I was running those commands in elevated prompt. Also, the deprecated Repair-ClusterSharedVolume internally just calls chkdsk, so it returned the same error.

After unregistering the HW VSS provider, the /scan ran successfully while the CSV was online. Although  not officially supported, I guess this is an acceptable workaround.

We're using DPM 2012 R2 to backup the virtual machines, so am I right assuming that I should be using this workaround only when backup isn't running, else it will fail?

Thanks for the clarification Donald.

I see! Got it!