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

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:

Click VM > Settings to open the virtual machine settings editor.
On the Hardware tab, check the CD-ROM properties. If the CD-ROM is set to Host Device, change it to Client Device.
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.
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.

To request a new product feature or to provide feedback on a VMware product, please visit the Request a Product Feature page.

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