Monitored disk status not changing the status of a node

Hello,

Per a post I found elsewhere on Thwack (Re: Monitoring Disk Space change the status of a node) the status of a node's interfaces and volumes should affect the node's status.  However, I have a node (lets call it FileServer1) that has a 100% full F: drive, and yet the node shows green status.  Is there some sort of configuration setting that I may be missing?