SIRIS, ALTO, and NAS: Hyper-V Manager error when attempting to start a Virtual ALTO



When you try to start a Virtual ALTO, you receive a Hyper-V Manager error that states "An error occurred while attempting to start the selected virtual machine(s)."


  • Datto ALTO


When storing a Hyper-V virtual machine on a volume with the ReFS file system, the integrity bit of the virtual hard disk (VHD or VHDX) must be turned off.


These steps are for solving the following Hyper-V Manager error.

Figure 1: Hyper-V Manager Error (click to enlarge)

There are two ways you can solve this problem:

  • Move the Virtual ALTO VHDX to a volume that does not use the ReFS file system.
  • Use the PowerShell cmdlet Set-FileIntegrity  (external link) to turn off the integrity bit of the Virtual ALTO VHDX. Assuming that the name of your Virtual ALTO is VirtualDevice.VHDX, run the following command:

Get-Item VirtualDevice.VHDX | Get-FileIntegrity

This command will verify the status of the integrity bit. Once you've verified this, run the next command to turn off the integrity bit: 

Get-Item MyVirtualHardDisk.VHDX | Set-FileIntegrity -Enable $False

Once you've done this, you should be able to start your Virtual ALTO with no errors.

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