case study for celerra de duplication

Hi,

We are planning to enable de duplication on several file systems in our environment. The file system size varies upto 4 TB.

We are bit concerned on  what performance impact it might cause.

Wanted to check if there is any case study available for enabling de duplication and the results

i went through enabling de duplication on celerra PDF, but didnt help much

appreciate any help on this...

Thanks...

Vanitha