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RAID setup for Ubuntu media server
(sh.itjust.works)
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Is HBA mode that rare? It seems pretty common. Either way, we don't know OP's hardware.
And I'm not scared of RAID controller failure, I'm scared of single point failure. I know it's highly unlikely, but the risk for stranded data is unacceptable IMHO unless you're recommending OP make sure they have a spare on hand.
Also, I never even mentioned ZFS (I've actually never even used it).