Sar is a system monitor command used to display system activity... its installed via the sysstat rpm. Use the command below to install sysstat. [root@fedora ~]# yum -y install sysstat Once installed you can check out the sysstat config file (/etc/sysconfig/sysstat) and configure how long to sar will keep your logfiles, on my system the default was 7 days. I changed this to 30 days.
Monitoring
Enabling SNMP in ESXi 4.1 using the Remote CLI
Based on the fact that ESX 4.1 is the last major release of ESX, I decided that I would make myself familiar with managing ESXi hosts. Since I monitor all my hosts via Zenoss, I figured that I needed to get snmp up and running first