LinuxQuestions.org - Deduplication with SDFS file system

I am trying deduplication with sdfs.(ubuntu 13.10 on Vm).

(http://opendedup.org/quickstart) followed the same steps as this

mounted the file system on /media/pool0/

When copied a directory containing some similar pdf's its not removing the duplicates and the size of the folder remains the same as the original.

Original directory size
1.6G /Worksheet/
1.6G total

Sdfs directory size
1.7G /media/pool0/Worksheet/
1.7G total

Is there any specific commands for enabling deduplicaiton feature in the SDFS volume. Or will dedpulication get applied to the files that we copy into the volume.?

Can some1 please also explain me how sdfs file system works?

Please let me know if u require anymore details... Help me i am stuck up

Thanks in advance