Munin does it by comparing `cat /sys/block/*/stat` e.g `cat
/sys/block/sda/stat` with the previous reading. This file contains 11
values:
https://github.com/munin-monitoring/munin/blob/devel/plugins/node.d.linux/diskstats#L440-L444
So previous rd_ios minus current rd_ios gives you and average IO/period.
You may "remember" these by storing them in a file, for example in
/var/cache/monit/sda.stat
Idézem/Quoting Graham Smith <[email protected]>:
I don't think there is anything built in for that. You may not need a
script per se, an application may have an exit status you could use to
denote a fail or success of performance quality. Possibly iostat or iometer
perhaps.
If it's not a simple numeric output, a wrapper script might not need to be
long and that could output a simple exit status to denote a success quality
which monit can handle easier.
I always think it's best to keep complexity out of monit and if you need to
do something fancy a script for anything odd is ultimately more modular as
you may find other uses for it.
Graham
On 18 May 2016 19:04, "Bryan Harris" <[email protected]> wrote:
Hello all,
Does Monit have a way to measure i/o latency and alert if say a 4k write
takes longer than some number of ms? I searched the mailing list and
manual and do not see anything. Otherwise I can always monitor a custom
script for this purpose.
Thanks in advance.
V/r,
Bryan
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