Home > Storage > PowerScale (Isilon) > Product Documentation > Data Efficiency > Next-Generation Storage Efficiency with Dell PowerScale Inline Data Reduction > Verifying inline deduplication
While there are no visible userspace changes when files are deduplicated, if deduplication has occurred, both the ‘disk usage’ and the ‘physical blocks’ metric reported by the ‘isi get –DD’ CLI command will be reduced. Also, at the bottom of the command’s output, the logical block statistics will report the number of shadow blocks. For example:
Metatree logical blocks:
zero=260814 shadow=362 ditto=0 prealloc=0 block=2 compressed=0