Public bug reported:
Recently a process wrote lots of data to the disk (and I'll take
responsibility for that) but the "Disk IOs per device" went up (makes
sense) and the "Disk latency per device" also went up (yup, so far so
good) but the "IO Service time" strangely went down! Yes, it showed more
latency but less service time. That's incredible. I'm incredulous.
I've been suspicious of this for some time, because I absolutely know
that /dev/sdc is a faster device than /dev/sda and /dev/sdb and for a
long time it has been showing the lowest latency and the highest service
time. It always did seem weird, but now I'm sure these numbers are
bogus.
** Affects: munin (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/919429
Title:
Munin "IO Service Time" graph gives completely implausible numbers
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