NFS config files?

[Tom H]

On Tue, Aug 11, 2020 at 5:24 PM Ken D'Ambrosio <ken at jots.org> wrote:
> On 2020-08-11 06:52, Karl Auer wrote:
>>
>> - why vers=3 between two 20.04 installs?
>> - why is it sooo slooow?
>
> 1) Probably because it's the default -- that's a guess, but I'm
> guessin' I'm right. If you *don't* want that (and do want 4), throw a
> "vers=4" into your options in the appropriate line in the fstab.

NFSv4 has been the default for a few years. Something in the setup
must be disabling it.

What's the output of "rpcinfo -s" or "cat /proc/fs/nfsd/versions" on the server?