Comments on: How to use dstat to monitor your Linux/UNIX server http://www.simplehelp.net/2008/11/13/how-to-use-dstat-to-monitor-your-linuxunix-server/ Common questions, simple answers Sun, 22 Nov 2009 15:28:55 -0500 http://wordpress.org/?v=2.8.4 hourly 1 By: oberförster http://www.simplehelp.net/2008/11/13/how-to-use-dstat-to-monitor-your-linuxunix-server/comment-page-1/#comment-9813 oberförster Wed, 21 Jan 2009 16:15:13 +0000 http://www.simplehelp.net/?p=1637#comment-9813 I've just found a little discrepancy between dstat and dd regarding the I/O: ifx@ids:/opt/informix/devices$ dd if=file_20GB of=/dev/null bs=2048 count=10000000 10000000+0 Datensätze ein 10000000+0 Datensätze aus 20480000000 Bytes (20 GB) kopiert, 261,738 s, 78,2 MB/s A shell running dstat at the same time showed me: -dsk/total----dsk/hdc-----dsk/hdd-- read writ: read writ: read writ 140M 104k: 62M 24k:7960k 28k 150M 0 : 64M 0 : 12M 0 160M 0 : 0 0 : 80M 0 154M 0 : 43M 0 : 34M 0 150M 0 : 75M 0 : 0 0 153M 56k:8384k 20k: 68M 8192B So it looks like we all should use dstat if we want to impress people with big numbers. Looks also like you shouldn't compare dstat to something else than dstat if you really want to compare systems, I doubt I'll use it any more for this kind of stuff any more. I’ve just found a little discrepancy between dstat and dd regarding the I/O:

ifx@ids:/opt/informix/devices$ dd if=file_20GB of=/dev/null bs=2048 count=10000000
10000000+0 Datensätze ein
10000000+0 Datensätze aus
20480000000 Bytes (20 GB) kopiert, 261,738 s, 78,2 MB/s

A shell running dstat at the same time showed me:

-dsk/total—-dsk/hdc—–dsk/hdd–
read writ: read writ: read writ
140M 104k: 62M 24k:7960k 28k
150M 0 : 64M 0 : 12M 0
160M 0 : 0 0 : 80M 0
154M 0 : 43M 0 : 34M 0
150M 0 : 75M 0 : 0 0
153M 56k:8384k 20k: 68M 8192B

So it looks like we all should use dstat if we want to impress people with big numbers.

Looks also like you shouldn’t compare dstat to something else than dstat if you really want to compare systems, I doubt I’ll use it any more for this kind of stuff any more.

]]> By: perfector http://www.simplehelp.net/2008/11/13/how-to-use-dstat-to-monitor-your-linuxunix-server/comment-page-1/#comment-9812 perfector Fri, 12 Dec 2008 08:59:52 +0000 http://www.simplehelp.net/?p=1637#comment-9812 Nice article. Nice article.

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