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Re: gather write metrics on multiple files

To: xfs@xxxxxxxxxxx
Subject: Re: gather write metrics on multiple files
From: Joe Landman <joe.landman@xxxxxxxxx>
Date: Thu, 09 Oct 2014 00:49:43 -0400
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On 10/09/2014 12:40 AM, Stan Hoeppner wrote:
Does anyone know of a utility that can track writes to files in an
XFS directory tree, or filesystem wide for that matter, and gather
filesystem blocks written per second data, or simply KiB/s, etc?  I
need to analyze an application's actual IO behavior to see if it
matches what I'm being told the application is supposed to be doing.

We've written a few for this purpose (local IO probing).

Start with collectl (looks at /proc/diskstats), and others. Our tools go to /proc/diskstats, and use this to compute BW and IOPs per device.

If you need to log it for a long time, set up a time series database (we use influxdb and the graphite plugin). Then grab your favorite metrics tool that talks to graphite/influxdb (I like https://github.com/joelandman/sios-metrics for obvious reasons), and start collecting data.

Thanks, Stan

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