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I can't speak with much experience, but what I have gleamed is.

- You generally want to avoid hardware raid, if the card dies you'll likely need to source a compatible replacement vs. grabbing another SATA/was expander and reconstructing the array.

- zfs handles the stack all the way from drives to filesystem, allowing them to work together (i.e filesystem usage info can better dictate what gets moved around tiered storage, or better raid recovery.

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My understanding is that hardware RAID is mainly a thing in the Windows world, because apparently its software RAID implementation is garbage

I'm not a big Windows Server guy, but as I understand it, in Windows you would use Storage Spaces instead of traditional RAID.

Storage Spaces is their branded RAID solution.

Apparently in the enterprise server versions it's fairly decent, but the desktop versions are pretty trash re: performance.

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