On 26 May 2016, at 14:31, Pierre-Philipp Braun <address@hidden> wrote:
Many thanks Viktor for your input. I also need IO performance monitoring (not
esp. lacenty like Bryna, graphs reporting usage would yet be nice) so I wrote a
little script based on your/Munin's method,
#!/bin/bash
[[ ! -d /sys/block/ ]] && echo /sys/block/ does not exist, exiting && exit 1
#[[ ! -d /var/cache/monit/ ]] && echo /var/cache/monit/ does not exist, exiting
&& exit 1
mkdir -p /var/cache/monit/
for disk in `ls -1 /sys/block/ | egrep -v '^fd|^dm-|^sr'`; do
readio=`cat /sys/block/$disk/stat | awk '{print $1}'`
writeio=`cat /sys/block/$disk/stat | awk '{print $5}'`
echo "$readio,$writeio" >> /var/cache/monit/$disk.stat
unset readio writeio
done
it produces,
# pwd
/var/cache/monit
# ll
total 16K
drwxr-xr-x 2 root root 51 May 26 14:21 .
drwxr-xr-x. 15 root root 4.0K May 26 14:20 ..
-rw-r--r-- 1 root root 26 May 26 14:21 sda.stat
-rw-r--r-- 1 root root 18 May 26 14:21 sdb.stat
-rw-r--r-- 1 root root 12 May 26 14:21 sdc.stat
# cat *
17579,219210
2292,480
939,3
How to integrate this into Monit? Is CSV a good choice as a format?
On 18/05/2016 23:05, SZÉPE Viktor wrote:
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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