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Cold migration fails with the error: Incompatible device backing specified for device (9105247)

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  • Cold Migration fails
  • You see the error:

    Incompatible device backing specified for device #

  • The VPXD logs contain the entries:

    Passthrough backing not supported: (vim.vm.device.VirtualCdrom)

    Exception thrown vim.fault.InvalidDeviceBacking


This issue may occur if CD-ROM properties are configured incorrectly.
You must ensure that the CD-ROM device is configured correctly.
To verify CD-ROM configuration:
  1. Click VM > Settings to open the virtual machine settings editor.
  2. On the Hardware tab, check the CD-ROM properties. If the CD-ROM is set toHost Device,change it toClient Device
  3. If no physical drive or ISO image is connected, check the .vmx file to see if it indicates if a CD-ROM or an ISO image is connected.
  4. If the .vmx file indicates a connected device, remove the CD-ROM from the virtual machine and add a new CD-ROM. The .vmx file is updated with the correct CD-ROM setting.

Additional Information

For translated versions of this article, see:



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