I'm looking for a tool to summarize how disk space is being used on very large partitions. Our file system is around 950TB, mostly broken up into 20TB partitions. There are some really nice graphical tools for visualising these file spaces:

<http://www.disksavvy.com/disksavvy_screenshots.html>

<http://methylblue.com/filelight/>

But I'm really not sure how well they will scale. Does anybody have any experience of these tools and can make any recommendations? Even something that parses and summarises a really big du output would be a good start.