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this post was submitted on 12 Aug 2024
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btrfs's RAID features are not production-ready, and at this point I doubt they ever will be. See:
https://en.wikipedia.org/wiki/Btrfs#Implemented_but_not_recommended_for_production_use
https://wiki.archlinux.org/title/Btrfs
https://www.phoronix.com/news/Btrfs-Warning-RAID5-RAID6
ZFS is definitely more robust.
It is true for raid 5 & 6. Raid 0, 1, and 10 are supposed to be production ready. I use raid 10 only with btrfs, anything else and I use zfs or mdadm.
I wouldn't go above two disks
Raid 1 is stable. The problem is that btrfs has performance issues with resilvering a large amount of data. That isn't something that can be fixed as it is a design flaw.
Maybe bcachfs will be production ready at some point
You have to avoid the raid types is lists as not ready. Looks like facebook uses btrfs without issues
Don't forget upstream: https://btrfs.readthedocs.io/en/latest/Status.html