thanks you so much for the answer, I am new to DD and still learning the best 
way to do this,  with the old basic disk backup, I group them together, then I 
group multiple library together, rather then me have to worry about which go 
which I used "Storage Unit Group". but from what you telling me is truth then 
we did have all OS window in one group, and the unix in another, then we have 
Oracle, however it still using the same SLP. now I got to think about setup 
more SLP and divide the backup out.  But here is another question come to mind, 
let say I have  set of Windows server being backup to DD1 and for some reason 
we have to change the policy to move to DD2, is this mean data dedup will take 
take place all over again as soon as I move to DD2 since it never have any 
calculation of those windows group ?

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