discrepancy btw volume size and transferred size by SnapMirror

[heightsnj]

I am calculating the snapmirroring speed.

Total Transferred suze us 25.7GB by "snapmirror show" command. 
However, it shows me total used size is 40GB by "df -g" command on the destination after initialization and completed with snapmirroring. 

So, why they have showed me in different sizes, and there are 14.3GB differences?

How much data really have been transferred?

Thanks!

[RajeshPanda]

@heightsnj  Let me know if you are still looking for the solution, i will help you find an expert who can answer to your query.

[heightsnj]

@RajeshPanda 

Yes, i am still looking for the answer. Thanks!

[artur_alikulov]

What is the size of the volume on your source system? Do you use deduplication and compression?

The difirence could be because of data efficiency technologies. SnapMirror preserves storage efficiency on the source and destination volumes, with one exception, when postprocess data compression is enabled on the destination. In that case, all storage efficiencyis lost on the destination