If you have a large active server running (possibly applies to Solaris only here), and find your disk space seems to dissappear quickly, and running `df` and `du` bring back different results, try running the following:

find /proc -type f -size +100000000c -ls

This will look at running processes on the system and find each one that has a file descriptor larger than 100M. If you have quite a few (like I do), try chaning the “100000000″ to “500000000″. From there, investigate each process to see which is larger, and whether its handling its files properly. Use `lsof` to see which files that PID has open, and if the files sizes match the file descriptor size of your above command. If not, that process isn’t closing its files properly, and will need restarting (and subsequent complaints to the developers).