As previously announced, I was working on a Nagios plugin to check a Dell Equallogic SAN. Well, I consider it to be done, at least to check the most important things.
Funny thing is, that the day I actually started to use the plugin (Nov 19) it already showed me a DISK CRITICAL and I was wondering, where in the plugin I made a mistake. But actually it was a real disk error. So already from the first day on it's a proven plugin!
You find the documentation and download link of the check_equallogic Nagios Plugin in the category IT Howto's.