sample frequency and count for sar

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To: sunmanagers@sunmanagers.org
Date: Fri, 29 Aug 2003 20:06:01 +0800

Hello,

I am building a set of scripts that will collect and display performance data from our Sun servers.

One of the counters I'll collect is produced by sar,

like this: "/usr/bin/sar < /usr/lib/sa/sadc 1 1"

This command would run every 5,10 or 20 minutes or so, output is stored in a database.

Question is this:

Instead of just taking one sample every time this command runs, would it be more meaningful to

take the average over let's say half a minute or a minute, as in

"/usr/bin/sar < /usr/lib/sa/sadc 6 10"

I'll build a history for at least a year, which will be used to produce trends by performing

simple linear regressions. Is it possible to say which method of collecting data would produce

more reliable results?

Regards Oscar

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