vSphere 6 added support for NFS version 4.1. NFS clients for both NFS version 3 and NFS version 4.1 are included as part of ESXi. Using NFS version 4.1 provides additional features and functionality over NFS version 3, but there are some significant caveats and limitations that must be accounted for when using NFS version 4.1 in a vSphere design.