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I am experimenting with the iostat -c 1 command, and I was wondering if there is a simple way of reading the current output and then separating the values so that I could generate a .csv file.

The goal is to be able to generate graphs, using the data outputted by iostat over a time period. I'm not looking for a complete script, just some hints that would help me achieve my goal.

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  • why not use a full fledged monitoring tool like check_mk /nagios ? Commented Dec 5, 2016 at 15:07
  • Failing that, what have you tried so far? Commented Dec 5, 2016 at 15:07
  • I'd start with munin or grafana rather than trying to roll my own, but good luck either way. Commented Dec 6, 2016 at 14:10

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Typically the same data that iostat collects and displays is also collected by sysstat a.k.a. sar

sar comes with a supporting tool sadf that can easily display the collected stats in a number of convenient formats, including , XML, JSON and CSV.

I.e. for CSV try something like:

sadf -dh -- <sar options>

Where for instance the sar options -b -d will display block device IO.

sadf -dh -- -b -d

This cheat sheet might point you at other useful sar options:

http://www.brendangregg.com/Perf/linux_observability_sar.png
(source: brendangregg.com)

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