Have enabled NFSV4 on FAS8200 CDOT.
1) Few servers are not able to mount with NFSV4. So also enabled NFSV3. I don't think this is a best practice to enable both.
2) Once NFSV4 ,we are planning to enable Kerberos's. I dono if this works? do we need downtime ?
Please take a look at the following kb incase you haven't yet.
How to configure NFSv4 in Cluster-Mode:https://kb.netapp.com/app/answers/answer_view/a_id/1030467
Supported NFS versions and clients:https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.cdot-famg-nfs%2FGUID-463C2A35-BE74-42F6-97FA-8338527800EF.html
Interoperability matrix for checking NFS client hosts:
You can absolutely have NFSv3 and v4 enabled side by side.
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