Hello, I had a RAID5 with 3 disks and one failed; now the filesystem cannot be mounted.
None of the recommendations that I found seem to work. The situation seems to be similar to this one: http://www.spinics.net/lists/linux-btrfs/msg56825.html Any suggestion on what to try next? Thanks a lot beforehand! sudo btrfs version btrfs-progs v4.4 uname -a Linux ubuntu 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux sudo btrfs fi show warning, device 2 is missing checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 bytenr mismatch, want=2339175972864, have=65536 Couldn't read chunk root Label: none uuid: 495efbc6-2f62-4cd7-962b-7ae3d0e929f1 Total devices 3 FS bytes used 1.29TiB devid 1 size 2.73TiB used 674.03GiB path /dev/sdc1 devid 3 size 2.73TiB used 674.03GiB path /dev/sdd1 *** Some devices missing sudo mount -t btrfs -o ro,degraded,recovery /dev/sdc1 /btrfs mount: wrong fs type, bad option, bad superblock on /dev/sdc1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so. dmesg | tail [ 2440.036368] BTRFS info (device sdd1): allowing degraded mounts [ 2440.036383] BTRFS info (device sdd1): enabling auto recovery [ 2440.036390] BTRFS info (device sdd1): disk space caching is enabled [ 2440.037928] BTRFS warning (device sdd1): devid 2 uuid 0c7d7db2-6a27-4b19-937b-b6266ba81257 is missing [ 2440.652085] BTRFS info (device sdd1): bdev (null) errs: wr 1413, rd 362, flush 471, corrupt 0, gen 0 [ 2441.359066] BTRFS error (device sdd1): bad tree block start 0 833766391808 [ 2441.359306] BTRFS error (device sdd1): bad tree block start 0 833766391808 [ 2441.359330] BTRFS: Failed to read block groups: -5 [ 2441.383793] BTRFS: open_ctree failed sudo btrfs restore /dev/sdc1 /bkp warning, device 2 is missing checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 bytenr mismatch, want=2339175972864, have=65536 Couldn't read chunk root Could not open root, trying backup super warning, device 2 is missing warning, device 3 is missing checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 bytenr mismatch, want=2339175972864, have=65536 Couldn't read chunk root Could not open root, trying backup super warning, device 2 is missing warning, device 3 is missing checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 checksum verify failed on 2339175972864 found A781ADC2 wanted 43621074 bytenr mismatch, want=2339175972864, have=65536 Couldn't read chunk root Could not open root, trying backup super sudo btrfs-show-super -fa /dev/sdc1 http://sebsauvage.net/paste/?d79e9e9c385cf1a5#fNwoEj5o2aQ6T7nDl4vjrFqEJG0SHeVpmGknbbCVnd0= sudo btrfs-find-root /dev/sdc1 warning, device 2 is missing Couldn't read chunk root Open ctree failed -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
