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Solved
Missing volume after hard reboot
After losing access (no web, ssh, mounts, anything) from my ReadyNAS Pro 6 running 6.7.4 firmware, I decided to hard-reboot it by holding down the power button until it powered off. after booting...
I'm going to consider the data lost, and rebuild/factory reset back down to 4.2 for stability.
I think this is the answer without getting into costly data recovery services, or massive time investment.
It looks like there's some file corruption. Per Kernel.log
Jul 12 20:27:09 readynas01 kernel: BTRFS: device label 33ea999f:data devid 1 transid 1431232 /dev/md127
Jul 12 20:27:09 readynas01 kernel: BTRFS info (device md127): has skinny extents
Jul 12 20:27:10 readynas01 kernel: BTRFS critical (device md127): corrupt leaf, slot offset bad: block=2291416563712, root=1, slot=77
Jul 12 20:27:10 readynas01 kernel: BTRFS error (device md127): failed to read block groups: -5
Jul 12 20:27:10 readynas01 kernel: BTRFS critical (device md127): corrupt leaf, slot offset bad: block=2291416563712, root=1, slot=77
Jul 12 20:27:10 readynas01 kernel: BTRFS error (device md127): failed to read block groups: -5
Jul 12 20:27:10 readynas01 kernel: BTRFS critical (device md127): corrupt leaf, slot offset bad: block=2291416563712, root=1, slot=77
Jul 12 20:27:10 readynas01 kernel: BTRFS error (device md127): failed to read block groups: -5
Jul 12 20:27:10 readynas01 kernel: BTRFS critical (device md127): corrupt leaf, slot offset bad: block=2291416563712, root=1, slot=77
Jul 12 20:27:10 readynas01 kernel: BTRFS error (device md127): failed to read block groups: -5
Jul 12 20:27:10 readynas01 kernel: BTRFS critical (device md127): corrupt leaf, slot offset bad: block=2291416563712, root=1, slot=77
Jul 12 20:27:10 readynas01 kernel: BTRFS error (device md127): failed to read block groups: -5
Jul 12 20:27:10 readynas01 kernel: BTRFS error (device md127): open_ctree failed
jak0lantash might have some suggestions on next steps.
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