I have had partitions made of 2 Tb (max allowed), the actual data that landed on this drive is 600Gb

Now I need to move the server to completly new hardware & the destination has 1 Tb drive (still plenty of space for the data)

But of course I can not mirror as nssmu compains that there is not enough space

How to resize NW partition (not the pool, as mirror is partition based)