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> BTRFS is frequently not considered stable enough for production usage.

synology NAS use btrfs by default. What is not stable?

Btrfs in single drive (and mirror/RAID1) modes are fine. The instability is in the RAID5/6 implementation[1]. Synology runs Btrfs (in single drive mode) on top of their own mdadm based RAID setup.

[1]: https://btrfs.wiki.kernel.org/index.php/RAID56

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