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Hi Jason, Earlier in this thread, you wrote that you were able ... to generate a file with a 32 GB variable size so the libraries appear to be working correctly. That was on an SGI Altix platform. Is this a new platform on which you can't write large variables? Are you remembering to use either the NC_NETCDF4 flag (for C programs) or the NF90_NETCDF4 flag (for Fortran 90 programs) in the file creation call, to specify that you want a netCDF-4 file rather than the default classic-format file? As an example, in Fortran-90 you would use something like status = nf90_create(path = "foo.nc", cmode = or(NF90_NOCLOBBER,NF90_NETCDF4), ncid = ncid) --Russ Russ Rew UCAR Unidata Program address@hidden http://www.unidata.ucar.edu Ticket Details =================== Ticket ID: YTY-788071 Department: Support netCDF Priority: Normal Status: Closed