Howdy Davide! You need to upgrade to HDF5 1.8.3-snap2. I think that could resolve your problems. I test the parallel I/O on a linux workstation with MPICH2. Sorry if you get two responses to this support request - I don't know what happened to my last attempt - seemed to vanish... Thanks, Ed Ticket Details =================== Ticket ID: GMO-635165 Department: Support netCDF Priority: Normal Status: Closed