250GB - cache
1TB - Pool
2TB - Pool
10TB - Parity
With only 3TB in the pool you’re going to be increasing the size of the pool potentially quite quickly depending on if you’re ripping DVDs or Blu-Rays to it.
You’ll soon need another drive to boost that pool size and I promise, that parity will keep those tears at bay if something happens.
The other alternative is “Accept All” or “Decline each one Individually by clicking three buttons to confirm your choice”