A vSphere administrator wants to upgrade NFS3 datastores to NFS4.1 on ESXi 6.5 hosts with running
production virtual machines.Which option is valid?
Run ESXi command to upgrade the datastore.
Unmount the datastore from a single host, then mount it as NFS 4.1 datastore, and repeat this one host at a
time until the mount has been upgraded on all hosts.
Create a new NFS 4.1 datastore, and then use Storage vMotion to migrate virtual machines from the old
datastore to the new one.
Right click the datastore and upgrade it as a NFS 4.1 datastore.
https://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vsphere.storage.doc%2FGUID-8A929FE4-1207-4CC5-A086-7016D73C328F.html (NFS version upgrades)