Sure you can, but it would be something like this:
300GB-1 = c0t0d0
300GB-2 = c0t1d0
500GB = c0t2d0s0 (300 GB slice is created on s0)
# zpool create test raidz c0t0d0 c0t1d0 c0t2d0s0
However, if you are going to use the add'l 200 GB on the 500GB
drive for something else, administration is more
I think you can if you create a slice on the larger drive that is equal to the
size of the smaller drives (so 300GB)
If you just add the whole large drive to the pool, you will lose the extra
space.
**Apparently if you later replace both of the smaller drives with 2 500 GB
drives, the pool sho
