Volume size utilization



We have created a Volume of 3.6 TB with UNIX Security Style, Deduplication and Compression enabled & Enable Fractional Reserve(100%) unchecked in OnCommand Systems Manager. 


There are no SnapShot or SnapMirror being configured for the volume. 


OS is Data OnTap 8.2.4P4 7-Mode.


Within that we have created a LUN of 3 TB which is mapped to a Windows Server. Current space utilization for LUN is 58%.


Current volume utilization is 95% with 170 Gb free.


I want to understand where this 400+ GB is being used.