OUT OF DISK SPACE
Control will give a message "illegal write request", CONTROL can not write to the hard drive
df -v This will tell you if the disk is full and which partition is full.
login as root or su -
cd /u (if this is the partition is full)
du -s * |sort -n
This will give you a list of directories which in order of where the drive is full
cd /u/LARGEST_DIRECTORY (eg. cd /u/printers
du -s * | sort -n this will sort the directories again to give you a clue
remove the largest files by typing rm x.x