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Do Synology actually use the multi-device options of btrfs, or are they using linux softraid + lvm underneath?

I know Synology Hybrid RAID is a clever use of LVM + MD raid, for example.

I believe Synology runs btrfs on top of regular mdraid + lvm, possibly with patches to let btrfs checksum failures reach into the underlying layers to find the right data to recover.

Related blog post: https://daltondur.st/syno_btrfs_1/

That was very interesting reading, thanks!

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