Montioring Novell Disk Space

Is there a program that can be emplimented to monitor volume space and which directory has increased in size. The company I work for had a user infected with the nimda virus and with over 1000 users it was extremely difficult to track down which work station this was coming from. With the help of a disk space monitor this task would have been much more simple. We are running a Novell network. Is there any such utility.
Thanks,
Jeremy