Chapter 7 HPSS User Interface Configuration
HPSS Installation Guide September 2002 435
Release 4.5, Revision 2
• IBM’s Parallel Operating Environment MPI, Version 3 Release 2
• Sun HPC MPI, version 4.1
• ANL MPICH, version 1.2
Otherversions of MPI may be compatible with HPSS MPI-IO as well. The mpio_MPI_config.h file
isdynamically generated from the host MPI’s mpi.h file, making it possible to tailor the interaction
ofHPSS MPI-IO with the host MPI. Earlier versions of these MPI hosts are known to be compatible
with HPSS MPI-IO, for example, but we recommend the use of the above versions for this release
of HPSS.
Thisconfiguration results in the construction of the file include/mpio_MPI_config.h. Applications
in C must be compiled with#include “mpio.h” which will also include the
mpio_MPI_config.h to determine the host interface requirements. Fortran applications must
includempiof.h and C++ applications are further required to include mpio.hbefore including the
hostmpi.h
HPSS MPI-IO supports the Fortran77 and C++ interfaces for the MPI-IO API, as specified in the
MPI-2standard. These interfaces require compatible Fortran77 and C++ compilers as described in
Section 2.3.1.6:Miscellaneous on page 49. The Makefile.macros allows tailoring of the MPI-IO
environment to selectively disable support for Fortran or C++, if compatible compilers are not
available, by setting one or both of MPIO_CPLUSPLUS_SUPPORT and
MPIO_FORTRAN_SUPPORT tooff.
The following environment variables can also be used to amend the MPI-IO API configuration:
TheMPIO_LOGIN_NAME defines the DCE login name of the principal who will be executing the
application.If specified along with MPIO_KEYTAB_PATH,which specifies the path name to a ��le
containing the principal’s security keys, each process in a distributed application will be able to
create the credentials necessary for DCE authentication to HPSS. If either is not specified, the
default is to use the DCE credentials for the current login session, if any.
TheMPIO_DEBUG can be toggled to direct MPI-IO to give messages when errors are detected. A
value of 0 (zero) will disable message reporting, and any nonzero value will enable reporting.
Inaddition to the MPI-IO-specific variables, any of the HPSS Client API variables can be used (see
Section 7.1:Client API Configuration on page 413). If using MPI-IO with the non-DCE API, the
HPSS_NDCG_SERVERSenvironment variable must be appropriately set, as described in Section
7.2.2:Environment Variables on page 416.
7.6 HDM Configuration

7.6.1 Introduction

HPSS provides distributed file system services by optionally allowing HPSS to interface with
Transarc’sDFS. DFS is a scalable distributed file system that provides a uniform view of file data
toall users through a global name space. DFS supports directory hierarchies, and an administrative
entity called filesets. DFS also supports ACLs on both directories and files to allow granting
differentpermissions to different users and groups accessing an object. DFS uses the DCE concept