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Cake day: July 24th, 2024

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  • blake2b checksum, zstd compression, raid1c4 metadata and raid6 data. Kernel 6.12, btrfs-progs 6.17, ECC RAM.

    The files in the affected inode haven’t been touched for a few years. Dmesg was something about zstd decompression failed and prevented btrfs send of an incremental snapshot as well as accessing one single file.

    Due to the size of the array, I don’t always get around to do a full scrub after a (albeit rare) system crash, so I wrote it off as probably that and didn’t analyze much further at the time.



  • I’m running a 60TB btrfs RAID with all the bells and whistles myself and just recently had an instance of some file being fucked up (probably just the wrong metadata bit being affected or something), which I noticed because btrfs send would repeatedly crash at that inum. All the redundancy may be there, but sometimes it’s not able to recover automagically.

    Not hating on btrfs at all - it helped me recover from a few fubar situations that could easily have been total data loss - but magical thinking (about all the fancy features) is dangerous.