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Hi Harsh, I noticed you have a beta version of a parallel netCDF library using MPI-I/O: http://hpcf.nersc.gov/software/libs/io/netcdf/sp/pusage.html This would be very useful to other netCDF users who have been asking about such a library. I would like to let others know about your achievement if it becomes available. We have incorporated a couple of fixes into our netCDF 3.5.1 beta10 version of the library that are specifically for parallel use: ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-3.5.1-beta10.tar.Z These were discovered by another group at Northwestern University and Argonne when they were developing a parallel netCDF library and they contributed the bug fixes back to us, so you may be interested in them. Is NERSC familiar with the work of the Northwestern/Argonne group? --Russ