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This indicates that the HDF5 library was being built with the wrong C compiler that does not support MPI. Follow the instructions in the ./release_docs/INSTALL_parallel file file, under the "IBM SP" section. Though it is geared towards a particular IBM installation, it does applies to the Regatta. The only exception is that you probably don't do the:


On the other hand, IBM has hundreds of environment variables and various compilers. Each site has various individual settings. Therefore, you should first try to compile and run some simple MPI-IO programs, both C and Fortran90, with the compilers,  mpcc_r


and mpxlf_r, respectively. Once you get your MPI parallel environment set up, you can proceed with the instructions mentioned above.