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A comment on A disk so full, it couldn't be restored. Parent comment
https://btrfs.readthedocs.io/en/latest/btrfs-filesystem.html
> GlobalReserve is an artificial and internal emergency space. It is used e.g. when the filesystem is full. Its total size is dynamic based on the filesystem size, usually not larger than 512MiB, used may fluctuate.
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https://btrfs.readthedocs.io/en/latest/btrfs-filesystem.html
> GlobalReserve is an artificial and internal emergency space. It is used e.g. when the filesystem is full. Its total size is dynamic based on the filesystem size, usually not larger than 512MiB, used may fluctuate.