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Hi. Bet you're going to get tired of me soon! I'd really like to see all I/O calls using MPI-IO instead of posix fread (as in nc_check_for_hdf5). The HDF5 guys might recognize that I've bugged them about this last year :> ROMIO can take a file system prefix to override automatic file system detection. Such a prefix could be "testfs:" for our tracing file system driver (does no I/O, but logs which processes wrote how much) or it could be "pvfs2:" if we want to acess this userspace file system and do not happen to have the kernel component running. So for example, in nc_check_for_hdf5, instead of using fread, maybe use MPI_File_open and MPI_File_read when examining the magic number, and USE_PARALLEL_MPIIO is defined. Likewise, nc4_create_file, and nc_get_file_version use POSIX calls. Thanks ==rob -- Rob Latham Mathematics and Computer Science Division A215 0178 EA2D B059 8CDF Argonne National Lab, IL USA B29D F333 664A 4280 315B