After deleting the data in gateway_cifs , how check space , how to ensure i regain space after deleting data.

Basically how ensure complete data is deleted and gained space back.

Config# show capac avai

Number of nodes:                            8

Number of nodes with storage role:          8

Total Raw Capacity:                     15 TB  (100%)

Used Raw Capacity:                      11 TB   (77%)

Free Raw Capacity:                     3.3 TB   (23%)

System Buffer:                         675 GB    (5%)

Regeneration Buffer:                   932 GB    (6%)

Available Capacity:                    1.8 TB   (12%)

Total Object Count:                     350 M  (100%)