You can view the amount of space savings achieved through deduplication and data compression on a volume by using the df -S command.
The space savings in Snapshot copies are not included when calculating the space savings achieved on a volume. Using deduplication does not affect volume quotas. Quotas are reported at the logical level, and remain unchanged.
node1> df -S /vol/VolA Filesystem used total-saved %total-saved deduplicated %deduplicated compressed %compressed /vol/vol1/ 236 2028 90% 244 51% 1784 88%