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Volume size utilization

Hi,

 

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.