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this post was submitted on 12 Aug 2024
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My only gripe with btrfs is that I've had systems come down from a single drive failure in raid quite "often" when compared to other FS.
ZFS is a ram hog but I always could do a live resilvering without downtime.
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
You have to avoid the raid types is lists as not ready. Looks like facebook uses btrfs without issues
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
Don't forget upstream: https://btrfs.readthedocs.io/en/latest/Status.html