couple of MFS booting problems:
 * in the RPC power controller, make sure that an "on" command succeeds
   by checking the status, retrying if it failed (we already did this for
   "off")
 * if nodes fail to boot up the MFS after a power on, try again with a
   power cycle.  I have seen "power on" leave pc600s hung, and a power
   cycle seems to cure it.