Submitted by “A common task for System Administrators is to monitor and care for a server. That’s fairly easy to do at a moment’s notice, but how to keep a record of this information over time? One way to monitor your server is to use the Sysstat package. Sysstat is actually a collection of utilities designed to collect information about the performance of a linux installation, and record them over time. It’s fairly easy to install too, since it is included as a package on many distributions.”
Sysstat is a great package and sar should be something any good systems admin should use. For those who like pretty graphs showing system load over time and don’t want to grok through the sar data, take a look at isag.
isag is a graphical representation of sar’s data and shows you system performance over time.
http://www.volny.cz/linux_monitor/isag/screens.html
You can get a redhat rpm from here:
ftp://mirror.switch.ch/mirror/redhat-contrib/noarch/noarch/isag-4….