Yes I know you can with pools. But my 48 Drives would be in the main array in unraid ? And yes I could go out and buy a load of bigger drives to make my array smaller but I've got all my drives for the same cost as about 3 x 22TB drives at £1500 and I'd need 14 x 22TB drives at over £7K maybe one day but not at the moment.
I think the 2 licence bit is a good idea if it would show up as one server ? Also why are they still using a usb why not a more reliable ssd or 2 ssd's separate from the drive pool?.
I would love to be still using unraid but having a supermicro 846 (24 Drives) and a supermicro 847 Jbod (36 Drives) so 60 drives capable. But currently running 48 drives with a mix of 4 - 8 and 10TB drives. But i've gone back to windows server 2019 as I'm over the 30 drive limit and can't get on with truenas ? don't know why ?.