We have a Ubuntu 14.10 server that has a BTRFS root filesystem. There was a power outage, and the server will not boot afterwards. We went into rescue mode, and / didn't mount there, in the /var/log/syslog we see: BTRFS: read error corrected: ino 1 of 398856193 (dev /dev/sda1 sector 795400) <repeated twice more with different innodes and sectors> parent transid verify failed on 397688832 wanted 901 found 408 <repeated once more with different numbers> BTRFS: Failed to read block groups: -5 rescue: mount: mounting /dev/sda1 on /target failed: Invalid argument rescue-mode: mount '/dev/sda1' /target failed BTRFS: open_ctree failed I've been reading through pages like https://btrfs.wiki.kernel.org/index.php/Problem_FAQ, and apparently there's a few things to try (e.g. mounting with -o recovery, btrfs-zero-log etc), and also using btrfs-restore. However, I'm wondering if the above specific error messages shed any light on what happened? Is there any metadata, or anything I can grab from the disks which would help diagnose it? -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
