I am setting up a DS1621+ with 4 16TB Ironwolf hard drives. I have 2 8TB Ironwolves from a previous NAS, DS220+. Is it Possible to add the smaller drives (8TB) to the DS1621+ that has the larger drives (16TB)? IF not, can I connect the DS220+ with the 2 8TB drives to the DS1621+ via the LAN2 ports and make use of the DS220+ also?