One quite straight-forward thing – which i didn’t really think about until I was playing with multiple zones and the FSS – was that you can actually have 0 shares allocated – which just means you get all the spare cycles. If you have 5 zones, all of which running FSS (and why wouldn’t you be), all configured like the following:-

ZoneID	zone Name	Shares
0	Global Zone	50
1	prod	50
2	preprod	25
3	test	0
4	dev	10

Pretty good for when you do want to make sure that any non-production zones should never impact production (well aside from memory and network impact).