Dear btrfs support community, after a bad power event, my 9 years old Btrfs has crashed. This Btrfs partirion is on an 8 disk mdadm array. After a few try on different options recovery found on "forums", have alreday tryed some
btrfs check --repair btrfs check --init-extent-tree btrfs check --clear-space-cache,...... btrfs rescue super-recover btrfs rescue chunk-recover btrfs rescue restore btrfs rescue chunk-recover: result on pastebin :https://pastebin.com/9aHewZU4 ..... .... Chunk: start = 26461360619520, len = 1073741824, type = 1, num_stripes = 0 Stripes list: Block Group: start = 26461360619520, len = 1073741824, flag = 1 No device extent. Chunk: start = 26490351648768, len = 1073741824, type = 4, num_stripes = 0 Stripes list: Block Group: start = 26490351648768, len = 1073741824, flag = 4 No device extent. Total Chunks: 13797 Recoverable: 12233 Unrecoverable: 1564 Orphan Block Groups: Orphan Device Extents: Device extent: devid = 1, start = 20624466509824, len = 1073741824, chunk offset = 26284193218560 Device extent: devid = 1, start = 20625540251648, len = 1073741824, chunk offset = 26285266960384 Device extent: devid = 1, start = 20628761477120, len = 1073741824, chunk offset = 26288488185856 Device extent: devid = 1, start = 20630908960768, len = 1073741824, chunk offset = 26290635669504 Device extent: devid = 1, start = 20640572637184, len = 1073741824, chunk offset = 26300299345920 Device extent: devid = 1, start = 20641646379008, len = 1073741824, chunk offset = 26301373087744 Device extent: devid = 1, start = 20643793862656, len = 1073741824, chunk offset = 26303520571392 Device extent: devid = 1, start = 20645941346304, len = 1073741824, chunk offset = 26305668055040 Device extent: devid = 1, start = 20838141132800, len = 1073741824, chunk offset = 26497867841536 Device extent: devid = 1, start = 20839214874624, len = 1073741824, chunk offset = 26498941583360 Device extent: devid = 1, start = 20840288616448, len = 1073741824, chunk offset = 26500015325184 Device extent: devid = 1, start = 20841362358272, len = 1073741824, chunk offset = 26501089067008 Device extent: devid = 1, start = 20842436100096, len = 1073741824, chunk offset = 26502162808832 Device extent: devid = 1, start = 20844583583744, len = 1073741824, chunk offset = 26504310292480 Device extent: devid = 1, start = 20845657325568, len = 1073741824, chunk offset = 26505384034304 Device extent: devid = 1, start = 20846731067392, len = 1073741824, chunk offset = 26506457776128 Device extent: devid = 1, start = 20847804809216, len = 1073741824, chunk offset = 26507531517952 Device extent: devid = 1, start = 20848878551040, len = 1073741824, chunk offset = 26508605259776 Device extent: devid = 1, start = 20849952292864, len = 1073741824, chunk offset = 26509679001600 Device extent: devid = 1, start = 20851026034688, len = 1073741824, chunk offset = 26510752743424 Device extent: devid = 1, start = 20852099776512, len = 1073741824, chunk offset = 26511826485248 Device extent: devid = 1, start = 20856394743808, len = 1073741824, chunk offset = 26516121452544 Device extent: devid = 1, start = 20858542227456, len = 1073741824, chunk offset = 26518268936192 Device extent: devid = 1, start = 20862837194752, len = 1073741824, chunk offset = 26522563903488 Device extent: devid = 1, start = 20867132162048, len = 1073741824, chunk offset = 26526858870784 Device extent: devid = 1, start = 20868205903872, len = 1073741824, chunk offset = 26527932612608 Device extent: devid = 1, start = 20869279645696, len = 1073741824, chunk offset = 26529006354432 Device extent: devid = 1, start = 20870353387520, len = 1073741824, chunk offset = 26530080096256 Device extent: devid = 1, start = 20875722096640, len = 1073741824, chunk offset = 26535448805376 Device extent: devid = 1, start = 20876795838464, len = 1073741824, chunk offset = 26536522547200 Device extent: devid = 1, start = 20877869580288, len = 1073741824, chunk offset = 26537596289024 Device extent: devid = 1, start = 20882164547584, len = 1073741824, chunk offset = 26541891256320 Device extent: devid = 1, start = 20883238289408, len = 1073741824, chunk offset = 26542964998144 Device extent: devid = 1, start = 20884312031232, len = 1073741824, chunk offset = 26544038739968 Device extent: devid = 1, start = 20885385773056, len = 1073741824, chunk offset = 26545112481792 Invalid mapping for 23079040999424-23079041003520, got 23080114061312-23081187803136 Couldn't map the block 23079040999424 Couldn't map the block 23079040999424 bad tree block 23079040999424, bytenr mismatch, want=23079040999424, have=0 Couldn't read tree root open with broken chunk error Chunk tree recovery failed Informations required for support: uname -a: Linux UBUNTU-SERVER 5.8.0-48-generic #54-Ubuntu SMP Fri Mar 19 14:25:20 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux btrfs --version: btrfs-progs v5.11 btrfs fi show: Label: none uuid: f4f04e16-ce38-4a57-8434-67562a0790bd Total devices 1 FS bytes used 24.71TiB devid 1 size 18.83TiB used 18.67TiB path /dev/md0 btrfs fi df / not mountable fs, so no results. dmesg |grep -i btrfs: [ 3.869542] Btrfs loaded, crc32c=crc32c-intel [ 3.927255] BTRFS: device fsid f4f04e16-ce38-4a57-8434-67562a0790bd devid 1 transid 524941 /dev/md0 scanned by btrfs (260) [ 667.478169] BTRFS info (device md0): disk space caching is enabled [ 667.722168] BTRFS error (device md0): parent transid verify failed on 23079040831488 wanted 524940 found 524941 [ 667.722181] BTRFS warning (device md0): failed to read root (objectid=2): -5 [ 667.742931] BTRFS error (device md0): open_ctree failed If someone have any idea if i have a little chance to get at least some of the data back, i will be very happy, as the last found backup of this massive partition was an 5 years old. Sorry for my English. Thierry
