root@reyals-filebox:~#mount -t btrfs -o ro,recovery,degraded /dev/sdc /media/storage
from log
[97782.998489] BTRFS info (device sdd): enabling auto recovery
[97782.998492] BTRFS info (device sdd): allowing degraded mounts
[97782.998494] BTRFS info (device sdd): disk space caching is enabled
[97791.451770] BTRFS (device sdd): parent transid verify failed on 10660258889728 wanted 20131 found 19709
[97791.451835] BTRFS (device sdd): parent transid verify failed on 10660258889728 wanted 20131 found 19709
[97791.451909] BTRFS (device sdd): parent transid verify failed on 10660258889728 wanted 20131 found 19709
[97791.451912] BTRFS: Failed to read block groups: -5
[97791.485669] BTRFS: open_ctree failed



root@reyals-filebox:~/git/btrfs-progs# ./btrfs rescue zero-log /dev/sdd
warning, device 1 is missing
warning devid 1 not found already
checksum verify failed on 10660436295680 found 04792A84 wanted EDD39A08
bytenr mismatch, want=10660436295680, have=10660436230144
Couldn't setup extent tree
checksum verify failed on 10660433723392 found B14AF516 wanted 5D10D3E2
checksum verify failed on 10660433723392 found B14AF516 wanted 5D10D3E2
bytenr mismatch, want=10660433723392, have=254192486267648
ERROR: could not open ctree




root@reyals-filebox:~/git/btrfs-progs# ./btrfs rescue chunk-recover /dev/sdd -v
All Devices:
        Device: id = 2, name = /dev/sde
        Device: id = 6, name = /dev/sdh
        Device: id = 5, name = /dev/sdg
        Device: id = 7, name = /dev/sdf
        Device: id = 8, name = /dev/sdc
        Device: id = 3, name = /dev/sdd

Scanning: 0 in dev0, 0 in dev1, 0 in dev2, 0 in dev3, 0 in dev4, 0 in dev5Segmentation fault (core dumped)