Thanks to the contributions of Chris Funderburg and Markus Becker, it is now possible to check a Dell Equallogic SAN for its disk pool utilization with the Nagios plugin check_equallogic.

I already received the solution of Markus a while ago (sorry to not have included your patch yet) and a few days ago I got an almost similar solution from Chris. I took the, in my opinion, best parts of both patches and created the new 'poolusage' check.

Thanks guys!