15

Occasionally, something on my system starts hammering the disk. I would like to log data that would let me know about I/O usage per process, then I could go back to it later and see what keeps doing this. How should I go about solving this problem? Bonus points for solving this for arbitrary block devices.

12

I would give iotop a try (Linux only). It is pretty good at giving you the processes with high I/O transfers, but iotop is more for displaying the current status than logging.

For logging, sar is always a good tool for performance aspects.

  • guichaz.free.fr/iotop – elmarco Aug 12 '10 at 18:56
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    worth noting that iotop is linux only. (at least I'm 99% sure it is) – xenoterracide Aug 12 '10 at 22:23
  • sar is also available on all unix versions that I ever worked with. – txwikinger Aug 13 '10 at 13:58
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    On Ubuntu systems (this might apply to all Linuxes), there is some debate weather iotop works correctly. See bugs.launchpad.net/ubuntu/+source/linux/+bug/493156 – Stefan Lasiewski Dec 17 '10 at 23:21
  • @Stefan: From what I read that will only affect distributions that have configured their kernel with CONFIG_TASK_DELAY_ACCT enabled. Is there something else in the thread I missed? – Steven D Dec 17 '10 at 23:52

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