From Corruption to Recovery: Inside a 12 TB btrfs Rescue Operation

This deep dive into a real-world btrfs filesystem recovery demonstrates both the fragility of corrupted storage systems and the potential for sophisticated recovery techniques. By developing custom tools and analyzing root causes, the author identified nine actionable improvements for upstream btrfs-progs that could prevent similar disasters for other operators. The incident underscores the critical importance of better recovery tooling and documentation for managing complex multi-device storage infrastructure.