03-23-2012
Worth reading the "sa2" script in case it deletes files before you have saved them. If you need to analyse a month's worth, you'll need a script to save the sa<nn> files daily smewhere where they don't get deleted and with a name (or directory name) containing the month and year.
You seem to be 9/10 there already. The trick is to get "sar" to do the maths and then just plot the average line.
There's a lot of interesting statistics in those files which can give you early warning of overload.
Good luck.
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SA2(8) Linux User's Manual SA2(8)
NAME
sa2 - Write a daily report in the /var/log/sa directory.
SYNOPSIS
/usr/lib/sa/sa2
DESCRIPTION
The sa2 command is a shell procedure variant of the sar command which writes a daily report in the /var/log/sa/sardd file, where the dd
parameter indicates the current day. The sa2 command handles all of the flags and parameters of the sar command.
The sa2 command is designed to be started automatically by the cron command.
EXAMPLES
To run the sa2 command daily, place the following entry in your root or adm crontab file:
5 19 * * 1-5 /usr/lib/sa/sa2 -A &
This will generate a daily report called /var/log/sa/sardd It will also remove reports more than one week old.
FILES
/var/log/sa/sardd
Indicate the daily report file, where the dd parameter is a number representing the day of the month.
AUTHOR
Sebastien Godard <sebastien.godard@wanadoo.fr>
SEE ALSO
sar(1), sadc(8), sa1(8), mpstat(1), iostat(1), vmstat(8)
http://perso.wanadoo.fr/sebastien.godard/
Linux DECEMBER 1999 SA2(8)