Kb186
Emulab FAQ: Testbed Operations: How do I clear Frisbee failures?
Emulab FAQ: Testbed Operations: How do I clear Frisbee failures?
All you do is go to the Image Descriptor page, click on the "Edit" link, and then clear the Load Address and Frisbee pid fields (in red dot mode).
Mike is usually the one to figure out why Frisbee actually died, but often the problem is transient and not something to worry about.