Do you have a PVFS file system setup? Wasn't sure based on what you said, but I tried to answer your specific questions.
- How do the system now it should use PVFS instead of NFS?
MPICH/ROMIO checks with the file system type and based on that will select which driver to use. You can force it to use a particular backend with "pvfs2:/path/to/file" in the MPI_File_open.
- Do I need to install both MPICH and PVFS? What about "accessing to PVFS files by using ROMIO interface"?
MPICH needs to be compiled with the PVFS library. There is a configure option in MPICH to enable PVFS support and to help find where the library is.
What happen if I only install MPICH (will it use PVFS or NFS?)
MPICH won't use PVFS if you don't have PVFS installed. kevin
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