I'm currently buying a server that NEEDS 30TB of storage, 15TB of which is logical and 15TB is physical. However the towers only allow 8 2TB 3.5 inch HDD's, which gets me to 16TB. How do I get another box of HDD's without needing another processor? Or does the 16TB fit the 15 logical and 15 physical requirement? I'm having a hard time understanding this.