If you have installed nagios-statd-server on the clients (hosts) and nagios-statd on the server, you can monitor the hosts' cpu, load, disk, etc.
nagios-statd requires the use of a real device not a symlink.
For all commands ! is the separator for arguments to the command.
define service{ use fionavar-service host_name darien service_description disk-root check_command check_disk_statd_level!/dev/ide/host0/bus0/target0/lun0/part1!85!90 }