Torque/Maui jobs failing suddenly and without output? Check disk space

Quick note: I just tracked down a problem with our Rocks cluster (which uses Torque and Maui) where suddenly submitted jobs were nearly always failing instantly and without any output -- even a simple echo hello world failed with zero output. Turned out one of the nodes had filled up / (which, in a default Rocks install, includes /opt/torque and /tmp) completely with the output from a month-old job that ran amok. This node happened to be allocated to most (but not all...) jobs, and so caused a lot of disruption.

I don't know how best to monitor this...