Hey guys, newbie here so I'm likely not going to ask the right question or provide enough information. But we've got a NetApp setup with 2 controllers and thus 2 heads. We recently added a new shelf with a different type of disks than what is currently on the system. My question is if we add all of the new disks to a single controller/head do we still need 2 hot spares on each head for that disk type, or should it be sufficient to have just two spares on the head that those disks are added to?