Description of problem:
Deploying a Windows VM with default settings (20GB disk) may lead to a deployment issue, as my Windows deployment needs a 50GB disk at least.
Unfortunately the error is hard to find.

Version-Release number of selected component (if applicable):
CNV 2.6 current


How reproducible:
Always


Steps to Reproduce:
1. USe a qcow2 Windows Image for deployment that is using a 50GiB disk
2. In the UI use the wizard and keep the defaults (20GiB Disk Size)
3. Create the VM

Actual results:
The VM status stays in "Starting" but the Event log shows a Warning with "Back-off restarting failed container".
Looking closer at the event it shows that the root-disk import fails. This import is retried forever.

Once you click on the link, you get to the pod details, still not revealing the 
reason of the failure.
You need to navigate to the "Logs" tab to finally see the real reason:

"[...]
E0203 14:16:34.001176       1 data-processor.go:239] Virtual image size 59055800320 is larger than available size 19788924395 (PVC size 59055800320, reserved overhead 0.055000%). A larger PVC is required.
Unable to convert source data to target format
[...]
"



Expected results:
The installation is aborted and a sensible error message is shown (e.g.: disk too small xx GiB needed, xx GiB provided)


Additional info: