Drobo Pro FS max capacity vs volume size

Hello, a few quick questions about the sizing of the volumes of the Drobo Pro FS and the max capacity of the whole Drobo.

What is the max drive size the Drobo Pro FS can take in each of the 8 slots?
Since the Drobo sets up 2 volumes for the shares and each share shows it has a max capacity of ~16GB, is that 16GB the max for the whole Drobo or for each volume?
How does the Drobo divide up the volumes? Are they divided up among all the drives or are they divided evenly (ie Volume 1 uses drives 1,2,3,4 and Volume 2 uses drives 5,6,7,8)?

I have tried researching myself but came up empty. Thank you for any info you can provide.