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This will be difficult for us to debug since we do not have access to an AIX system. Also, netcdf 4.1.3 is pretty old; any chance you can upgrade to the latest version? In any case, try this command and send us the output (assuming its not proprietary): > ncdump -hs <name of compressed file> > Description of problem: My programmer issues the following command using > NetCDF 4.1.3 to compress a NetCDF file on AIX and it does not compress at all. > > On Linux using NetCDF V4.6.1 it does compress successfully. > > /usr/local/netcdf-4.1.3/bin/nccopy -d 6 > BHP-TPW_v01r0_blend.nc russ.nc > > -rw-r--r-- 1 Pdpeas dpeas 37574958 Jun 11 18:06 > BHP-TPW_v01r0_blend.nc > > -rw-r--r-- 1 root system 37574768 Jun 11 18:55 russ.nc > > > =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: SNE-995575 Department: Support netCDF Priority: Normal Status: Open =================== NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.