Whoa! Future looks bright
When someone hacks a "mount.pvfs" this will have more uses than just for PVM. This would be a good replacement for Storage Area Networks (SAN).
Imagine one or more linux frontends that load-balance TCP-sessions with RNAT/IP_ROUTE_MULTIPATH to a bunch of backends. The backends share vital data over PVFS.
Ie. one could build a load-balanced TCP/IP service with standard daemons, no need to buy or develop special SW.