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You end up wasting a ton of space though because each vdev has its own parity drives.
No matter what setup you use, if you want redundancy, it'll cost space. In a perfect world, 30% waste would allow you to lose up to 30% of your disk space and still be OK.
..but that extra percentage of used space is the intrinsic cost.
What you lose in space, you gain in redundancy. As long as you're not looking for the absolute least redundant setup, it's not a bad tradeoff. Typically running a large stripe array with a single redundancy disk isn't a great idea. And if you're running mirrors anyway, you don't lose any additional space to redundancy.
Yep I feel this way.
No point in pricing a single HDD because I'm shooting for parity on every vdev I spin up.
Fair enough, it does add a good chunk of power usage though as HDDs are pretty power heavy at 5-7W or so.