HP-MPI 2.2.7 stops with the following (or similar) error message
libibverbs: Fatal: couldn't open sysfs class 'infiniband_verbs'.This occurs, for example, on GigE-connected ROCKS clusters with OpenMPI installed. The error is caused by the fact that there are Infiniband libraries installed without corresponding kernel drivers and/or hardware. In this case, one has to enforce the use of TCP by HP-MPI, which can be done using one of the methods below:
$ADFBIN/hpmpi/bin/mpirun.mpich -TCP ...
Any of these options will make sure all other interconnects but TCP are ignored.