Document URL:

https://access.redhat.com/documentation/en-us/openshift_container_platform/4.11/html-single/virtualization/index#virt-overriding-default-fs-overhead-value_virt-reserving-pvc-space-fs-overhead

https://access.redhat.com/documentation/en-us/openshift_container_platform/4.12/html-single/virtualization/index#virt-overriding-default-fs-overhead-value_virt-reserving-pvc-space-fs-overhead

Section Number and Name:

9.20.4.2. Overriding the default file system overhead value

Describe the issue:

The mentioned procedure is asking to edit `spec.config.filesystemOverhead`. This will fail with the below error:

~~~

1. oc edit hco -n openshift-cnv kubevirt-hyperconverged
   Warning: unknown field "spec.config"
   hyperconverged.hco.kubevirt.io/kubevirt-hyperconverged edited
   ~~~

We have to edit spec.filesystemOverhead instead:

~~~

1. oc get hco -n openshift-cnv kubevirt-hyperconverged -o yaml |yq -y '.spec.filesystemOverhead'
   global: '0.1'

1. oc get cdiconfig config -o yaml |yq -y '.status.filesystemOverhead'
   global: '0.1'
   storageClass:
   ~~~