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btrfs appreciation post
(lemm.ee)
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this post was submitted on 14 Aug 2023
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Agreed, RAID 1 (and 10) are pretty stable.
Moderately fun fact, RAID 1 in BTRFS is not really RAID 1 in the traditional sense. Rather it's a guarantee that your data lives on two separate drives. You don't know which ones though. You could have one copy of everything on a 12TB drive, whith various secondary copies distrivlbuted on three 4TB drives.
Traditional RAID 1 works ONLY with two drives, with a capacity of the smaller drive as upper limit. The way to extend a traditional RAID 1 array is by adding two new drives and creating a RAID 10 with all four. (Multiple RAID 1 striped)
This right here is what has made it so flexible for me to reuse salvaged equipment. You can just chuck a bunch of randomly sized drives at it, and it will give you as much storage as it can while guaranteeing you can lose any one drive. Fantastic.