Year	Total	Adds		Data	Parity	Spare	Structure
1	12	12		8	3	1	8D - 3P - 1S
2	23	11		16	6	1	8D - 3P - 1S
3	34	11		24	9	1	8D - 3P - 1S
4	45	11		32	12	1	8D - 3P - 1S
							
							All HD = 18TB WD Gold
							dRAID config vDev - 8D - 3P - 1S 
							"At year 4, the array is fully built.Ê"
							
							
							Further expansion requires:Ê
							- Another chassis (for a cluster)Ê
							- Replacing ea HD w larger HDs 1 at a time.