In the node Dashboard, Hudson always shows disk space and temp space in GB. If the available space is less than 1GB, this number is rounded down to 0GB. It would be better if Hudson displayed ">1 GB" (or the value in MB) unless there really was no free space on the disk.

I encountered this during routine maintenance, when I checked on the Hudson node status and saw the attached image. I logged into the 0GB slave to verify that it wasn't completely out of space before I realized that Hudson was just rounding down.