Date: Sat, 15 Oct 2005 11:36:21 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Josh Paetzel <josh@tcbug.org> Cc: questions@freebsd.org Subject: Re: Gathering statistics on disk usage Message-ID: <20051015163621.GC21223@dan.emsphone.com> In-Reply-To: <200510151048.39626.josh@tcbug.org> References: <200510151048.39626.josh@tcbug.org>
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In the last episode (Oct 15), Josh Paetzel said: > I am trying to set up mrtg to graph disk usage. I've tried using the > output of iostat to provide me with usage in MB/s. The problem with > this is that moving data from disk to disk on the system causes the > usage to jump to around 30MB/s. Even with mrtg configured to draw > the graphs logarithmically they basically blow up and the normal > transfers are not really visable. systat -vm gives statistics on > disk usage with a percent busy field. This stat would be easier to > graph and I would like to use it. My problem is that I can't seem to > extract the output of systat properly. I've tried doing systat -vm | > tail -n -1 and that doesn't work. I've also tried systat -vm > > somefile.txt and that doesn't work. There doesn't seem to be a way > to get systat to run once and then quit either. > > Can anyone think of a way to either capture systat's output or > recommend a utility that will give me a % busy output? I've tried > iostat without success. If you apply the patch at http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/68840, you will be able to get %busy stats out of iostat. You can also try installing net-snmp and polling the diskIOLA5 value for the disk, but on my system at least, the values don't seem to make sense (I have seen numbers from -2546 to 3000). -- Dan Nelson dnelson@allantgroup.com
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