btrfs raid1 metadata, single data

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Hi, I was wondering.

What exactly is contained in btrfs metadata?

I've read about some users setting up their btrfs volumes as
data=single, but metadata=raid1

Is there any actual benefit to that? I mean, if you keep your data as
single, but have multiple copies of metadata, does that still allow you
to recover from data corruption? Or is metadata redundancy a benefit to
ensure that your btrfs volume remains mountable/readable?


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