The PFS under MPI-IO clearly doesn't have to be a POSIX one; PVFS is stateless. I can't comment on that specific intention, which isn't in the standard's ration

The PFS under MPI-IO clearly doesn't have to be a POSIX one; PVFS is stateless. I can't comment on that specific intention, which isn't in the standard's rationale. Where is it documented? You'd have to argue with Rob Latham about whether "MPI is a good setting for parallel i/o".