RAID-5 and higher (except 10) are excellent solutions for both speed and protection, however I would only suggest you do it if you have a dedicated hardware RAID card.
I'd do RAID-6 if you are willing to go the hardware RAID route, it is fairly new but is a standard on all new cards.
Unfortunately, for RAID-6 to be efficient, you need 5+ drives. If you have 3 drives, RAID-5 suffices, and if you have 4, RAID-5 and 10 works.
Linus explains all else well.
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