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I have been googling for a while and have not found definitive answer.
I saw Btrfs mirroring chunks of data and not exactly a whole-drive mirror like a traditional RAID. Now assume I have 8 1TB drives in a single RAID1 pool of Btrfs. Does this mean I can theoretically lose even 4 drives without losing any data (losing 1 drive per mirrored pair)? And if it were 7 drives can I lose as many as three?
So there's no way to make it save 3 copies? – endolith – 2019-02-15T05:44:56.023
1Currently not. If you have a 3+ disk setup and need that level of redundancy then you can look into using ZFS with its various RAID levels that can allow for better disk redundancy. Example: 3 drives using ZFS RAIDZ2 will allow two disks to fail while still keeping your data intact. – Hermanio – 2019-02-16T19:29:04.410