> Another reason to recommend spares is when you have multiple top-level 
> vdevs
> and want to amortize the spare cost over multiple sets.  For example, if
> you have 19 disks then 2x 8+1 raidz + spare amortizes the cost of the 
> spare
> across two raidz sets.
>  -- richard

Interesting - I hadn't realized that a spare could be used across sets

Thanks!
Kent

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