Raw aggregate size is 4.04TiB. 10% is reserved for WAFL and is never visible which leaves 3.63TiB. As it is traditional volume, 20% is by default reserved for snapshots (and is not counted as available space). Which leaves exactly 2.9TiB. Now NetApp traditionally used definition of GB as 1024 x 1024 x 1000 and my experience is that FilerView is using these units. Which gives us approximately 3.05 "NetApp TB".
"aggr show_space" gives much better information of aggregate space consumption.