NetApp Space Checker - Example Plugin
This plugin has been written during a workshop on the last Nagios-Conference in Nürnberg (Sept. 2008). It checks for free space on all volumes on a given NetApp-Filer. Both traditional and flexible volumes are checked. As documentation the slides from the workshop are included (German).
Update: I have written several more plugins, which are described in detail on my homepage: Deutsch / English.