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Aryeh Gregor:
I'm looking at this, but I have no brighter idea than just running du on it, which is taking a very long time.
I wrote a tool called summdisk for this, which produces reports on per-user disk usage:
http://lists.wikimedia.org/pipermail/toolserver-announce/2010-September/000343.html
Unfortunately it still takes a very long time to run. According to df, there are 136,110,408 inodes used on the volume[0]; I wonder if people who currently create large numbers of small files could save some accounting space by aggregating them into larger blocks, like OSM's meta-tiles.
- river.
[0] of which ~127m or 93% are used by a single user