add bigger disks to existing pool

Hi,

Background:

I have a ZFS Storage 7420 with 6 Sun Disk Shelves (DS2) attached, homing 3TB disks.

I have one big zpool (132 disks for data+parity) with double-parity RAID and NSPF (no single point of failure).

I want to increase the capacity, but the available disk enclosures DE2-24C now have 4TB disks installed.

Question:

What happens, when I add 4TB disks from the new enclosure to the existing 3TB-disks pool (keeping DP-RAID and NSPF)?

I could think about two possibilities:

(A) Only the first 3TB of the new disks are used; this would mean wasting about 140TB (1TB per disk).