Mac Server Hard Drive almost full

OS Server 4.1 running OS 10.5.8 and Parallels 5; 600 GB HD with only 42 GB remaining.
By using a Terminal command (sudo du -x -h -d 1 /), I was able to identify a "Shared Folder" as occupying 523GB. The problem is that when I highlight the folder and click GetInfo, it only shows it to be 5.07GB. I also ran WhatSize, and it correctly indicated my 595GB HD had 554GB used, but the list it produced for the "Shared Folder" showed it to be only 5.07GB
Does anyone have any thoughts on this dilema?

[trevor]

Using the Finder's Get Info or other tools that run in the GUI such as WhatSize, you will only see the statistics for files that you have permission to, but the 'sudo du...' command will show you statistics for everything, since 'sudo' gives you temporary root access, and root user knows all. So there's a bunch of stuff in the Shared folder that your user doesn't have permission to see. But it's there.

For the below, I'm assuming that when you say "Shared Folder", you actually mean the "Shared" folder which is in the Users directory? If you mean some other folder then please let us know.

Can we see the results from the Terminal of

ls -alOe /Users/Shared
sudo du -x -h -d 2 /Users/Shared
id
echo "done"

Trevor

[agentx]

also you can use http://www.omnigroup.com/products/omnidisksweeper/
to see what is taking up space.

[tlarkin]

Have you tried rebooting it? What services does this server run?

[ehemmete]

I would guess that the problem is that the files taking up all the space are owned by another user so "you" can't see them to find their size. Try running OmniDisksweeper as root or using the CLI as root to look in that folder.
sudo /Applications/OmniDiskSweeper/Contents/MacOS/OmniDiskSweeper