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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Seconded. ZFS needs to see the physical devices, so hardware RAID is out. It implements a RAID-5-like parity-based software solution called RAID-Z, and is capable of disk mirroring.
It can work with hardware RAID or with a single physical disk, but don’t expect it to last for a long time, and definitely don’t use it beyond testing.