The test is done with a netcdf4 file from here -
http://rain.ucis.dal.ca/ctm/GEOS_0.5x0.625_NA.d/MERRA2/1980/01/MERRA2.19800101.A1.05x0625.NA.nc4


>From 20.04 nfs server

v3 mount test -   mount -t nfs -o vers=3  192.168.1.225:/nfs /tmp/test/

ncdump  -h -s MERRA2.19800101.A1.05x0625.NA.nc4|tail -2
ncdump: MERRA2.19800101.A1.05x0625.NA.nc4: MERRA2.19800101.A1.05x0625.NA.nc4: 
NetCDF: HDF error


v4 mount test - mount -t nfs -o vers=4  192.168.1.225:/nfs /tmp/test/

ncdump  -h -s MERRA2.19800101.A1.05x0625.NA.nc4|tail -2
                :_Format = "netCDF-4" ;
}

It works fine.


>From 18.04 nfs server -

v3 mount test -

ncdump  -h -s MERRA2.19800101.A1.05x0625.NA.nc4 |tail -2
                :_Format = "netCDF-4" ;
}


      Works fine as expected. So something has changed between 18.04 and 20.04 
that breaks v3 mounts it seems. Thanks.

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https://bugs.launchpad.net/bugs/1903974

Title:
  issue reading netcdf4 files with nfs v3 on ubuntu 20.04

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