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I'm using FreeBSD. I would like to write a munin plugin to log it, but i don't understand how to get this data.

    • I have a feeling that the answer will involve dtrace, however I'm not familiar enough with the technology to write a full answer on this subject...

I don't believe there's a way to measure this directly without abusing dtrace.

Some things that may be helpful:

  • gstat(8) - Geom device statistics, can show you raw disk activity / workload
    Doesn't directly measure latency though.

  • ioping - Lets you measure latency from userland (you could run it & log/chart the results)
    Downside: Adds load to do the test, passes through the VFS layer, and can't test the underlying drive unless you reserve a partition for it to use.

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