"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."