If you have a backup copy job in CommVault that fails with the error " Failed to Open Disk" then right click the job and select view logs.
Click 'view all' on the log file window and then search for 'Failed to Open Disk'.
In my case, the error was because there was an independent disk on the VM. Click here for more information about independent disks.
If you would like the backup copy to complete with errors instead of failing the job, then you set an additional setting to the media agent
http://documentation.commvault.com/additionalsetting/details?name="IgnoreUnsupportedDisks"&id=1318
Click 'view all' on the log file window and then search for 'Failed to Open Disk'.
In my case, the error was because there was an independent disk on the VM. Click here for more information about independent disks.
If you would like the backup copy to complete with errors instead of failing the job, then you set an additional setting to the media agent
http://documentation.commvault.com/additionalsetting/details?name="IgnoreUnsupportedDisks"&id=1318
Updated: Dec-2020
Another reason why backup can run into 'Failed to open disk' is when there is an unintialized disk within the windows VMs. So check on the disk management UI if there are any uninitialized disks present.
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