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Btrfs seems to work perfectly well in synology NAS. It must be some other combination of options or functions in use from what is available in synology that garners the bad reputation

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Synology uses BTRFS weirdly, on top of dmraid, which negates the most well-known BTRFS bugs in their RAID5/6 implementation*. Best I can tell they also have some custom modifications in their implementation as well, though it's hard to find much info on it.

* FWIW, I used native BTRFS RAID5 for years and never had an issue but that's just anecdata

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