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Is there a daemon-type application for Linux, that runs in the background, periodically maintaining a windirstat-type picture of the file system?

Ideally it would have its own web interface, but I could obviously hack one together in PHP if not.

Oh, and it would have to run on ultra-low IO priority. I don't want my disks getting thrashed either, for fear of shortening their lives.

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Consider looking at Alternativeto.net to answer what is equivalent of -program- for -other-OS-. –  Justin Dearing Aug 9 '12 at 0:21
    
That's a great site, thanks for the link. However, what I want isn't a carbon copy (that would be KDirstat which already exists). I want a server daemon that generates an image for later display. –  Fela Maslen Aug 9 '12 at 0:25
    
How about munin? If you'd like, I'll write up an answer on that. –  pkhamre Aug 14 '12 at 6:22
    
I'd heard of munin. It's not exactly what I'm looking for so don't bother putting it in an answer, but it is definitely a good program. –  Fela Maslen Aug 15 '12 at 17:28
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closed as not constructive by mgorven, Scott Pack, EEAA, Michael Hampton, HopelessN00b Genius of network Aug 24 '12 at 17:44

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