Could you please let us know whether you have pools configured? or Raid Group.  if its pool, then from the pool preperty (browse the tab Storage >> Pool / Raid Groups) you can find for each, otherwise you can use the Unisphere report (Monitoring >> Reports ), follow the one you're intended
I am very new to supporting our SAN.  I was asked to provide our used space vs. available space on our Cx4-240, Unisphere ver is v1.0.0.30.  I've searched through existing posts in here, and couldn't find the tab that was mentioned, and the reports tab I can find says "No storage system in the domain supportthe functionality of generating report." when I run the Reports Wizzard.   I see the very high level view of how much space is carved out, and what's left when I open Unisphere.  Is there a place to find how much of this space is used?
Report, or view, used space vs. available space for SAN newbie.