Dedup strategy

Hi 

I am setting up a new  BE 2014 envt and using the BE dedup option with HP MSA as disk storage.

Since I am backing up VMs (using API) which are a mix of Linux and Windows does it make sense to have 2 diff disk libraries one as target, 1 for Linux VMs and other for Windows ?

Will this give better dedup ratio than having a single disk library for both VMs ?

Also I have couple of phsyical Wndows servers which have DBs running on it. Any suggestions on what config will give me the best dedup ratio.

3 diff disk library (1 each for Windows VM. Linux VM, phyiscal servers )?? or have all of them point to a single disk library ?

Thanks in advance.