Confirm the NFS datastore cannot be unmounted using the following steps with [email protected] - https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-1B56EF97-F60E-4F21-82A7-8F2A7294604D.html
If the option to unmount the datastore is greyed out within the unmount wizard, please create an SR with VMC GS (Creating and managing Broadcom support cases) with the request to unmount the datastore. Please provide the name(s) of the datastore and the ESXi host(s) that the datastore is wanting to be unmounted from.
Impact/Risks:
There should be no impact/downtime to the Cloud vCenter or ESXi hosts when unmounting the NFS datastore.