Re: Disk or I/O latency?

[SZÉPE Viktor]

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 <address@hidden>:

> 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" <address@hidden> 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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> > https://lists.nongnu.org/mailman/listinfo/monit-general



SZÉPE Viktor
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