I have a VPS running 32 bit Ubuntu (Precise Penguin) on a Linode VPS, and something is making runaway disk usage. I've received multiple I/O warnings from Linode (not 'warning' in the sense of "Stop it!" but "FYI; this may be a problem") about IO usage on disk. I've pruned many of the larger things I had on the filesystem but didn't need, but that is just masking the problem. The disk keeps getting full, even if I delete my website logfiles (and my website is relatively high-traffic, but not nearly large enough to swamp a disk).
My present best attempt is to run (as root):
find / -print | xargs du -sh > ~jonathan/tmp/size.1; sleep 7200; find / -print | xargs du -sh > ~jonathan/tmp/size.2
and then, when that's done, run a diff. That process is running now.
Is there anything else I should be aware of? Are there known causes of runaway disk usage on Precise and/or Linode VPSes? Linode said they were not able to report what it was that was growing rapidly enough to trigger I/O warnings.