Today a new version (20111031) of both Nagios plugins check_storcenter and check_equallogic was released.
Thanks to the patience and some tests of David Lynum, a new version is available where the memory check type should now work on all StorCenter's. Some StorCenter returned the string kB when checking the memory (instead of only an integer).
François Borlet-Hote found a problem in the ethif check where some Equallogics returned the status 1 or 2 instead of up or down. This caused the ethif check to fail. The new version now supports both ways of status (either string or int).