Howdy Dr. Bader, When building netCDF for parallel I/O, you must build HDF5 with the --enable-parallel option. There is no --enable-parallel option for netCDF, it will automatically detect that HDF5 has been built for parallel, and then build netCDF parallel I/O. The missing pnetcdf file on the ftp site has been replaced. Thanks for reporting this problem. You might be interested in trying the latest beta release, which has performance improvements for parallel I/O: ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-4.1.2-beta1.tar.gz Thanks, Ed Ticket Details =================== Ticket ID: CHP-946266 Department: Support netCDF Priority: Critical Status: Closed