If built with --with-elan, pdsh may be used to run MPI jobs on a QsNet 
interconnect.  This option requires that you have the Elan user space 
libraries installed (qswelan-r RPM for Linux) and that your kernel be 
patched to run the 'elan3' and 'rms' device drivers.  Pdsh can run 
independently of the RMS product (the 'rms' kernel module, which is used
by pdsh, is a distinct facility from the RMS product).

Pdsh can also be run via the Quadrics RMS 'allocate' command such that 
allocate takes care of the node reservations and passes a batch ID through 
to pdsh via the RMS_RESOURCEID environment variable.  Pdsh retrieves the list 
of allocated nodes out of the RMS database using the rmsquery command.