There are 24 4TB NL-SAS disks total, 12 in the FAS, 12 in a shelf. I'm probably just going to go ahead and do two aggregates of equal size since that's what the automatic config wizard wanted to do and NetApp indicates that it does things per their best practices. It wanted to make 2 RAID-DP groups of 11 disks, and put each in a seperate aggregate, and give each aggragate to a controller.