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Can someone explain me how RAID works? (self.selfhosted)

submitted 7 months ago by Presi300 to c/selfhosted

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I recently got a few (5) hard drives to turn my home server into a NAS with trueNAS scale and my idea is to have 4 usable and 1 for redundancy, my question is... How does RAID work, like what is RAID 0, RAID 5, software RAID etc, and does any of that even matter for my use case?

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[–] redline23 1 points 7 months ago

I personally wouldn't use raidz1 because it seems too risky to me. I'd have higher redundancy.

Some links

https://www.truenas.com/community/threads/raidz1-vs-raid-5-ures.42598/

https://www.truenas.com/community/threads/5x-4tb-raidz1-array-rebuilding-with-nre-ure-issue.13719/

https://magj.github.io/raid-failure/

The last link is talking about actual raid and not zfs. But it has a 50/50 chance with a URE rate of 10^14 to lose the array. Raidz1 maybe won't have that catastrophic of a failure, but you'd still be rolling the dice on some corruption.