我进行了在线升级，从软 raid5（3TB*8 磁盘）升级到 raid6（3TB*10 磁盘）。这导致逻辑卷组崩溃，使设备无法挂载。我尝试使用所述方法恢复文件这里。
但是即使完成最后一步“btrfs restore -i -o -v -t ”，也没有恢复任何东西。
请帮助我恢复我的文件。提前致谢。
bmxboy@bmxboy-virtual-machine:/$ sudo mount -t btrfs /dev/vg1/volume_1 /mnt/ds001 -o ro
mount: /mnt/ds001: wrong fs type, bad option, bad superblock on /dev/mapper/vg1-volume_1, missing codepage or helper program, or other error.
bmxboy@bmxboy-virtual-machine:/$ sudo mdadm -D /dev/md2
/dev/md2:
Version : 1.2
Creation Time : Thu Mar 28 20:24:15 2019
Raid Level : raid6
Array Size : 23403556352 (22319.37 GiB 23965.24 GB)
Used Dev Size : 2925444544 (2789.92 GiB 2995.66 GB)
Raid Devices : 10
Total Devices : 10
Persistence : Superblock is persistent
Update Time : Fri Apr 19 08:55:24 2019
State : clean
Active Devices : 10
Working Devices : 10
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Consistency Policy : resync
Name : DS001:2
UUID : 356ff063:76450548:c57674b6:69223636
Events : 29235
Number Major Minor RaidDevice State
0 8 131 0 active sync /dev/sdi3
1 8 115 1 active sync /dev/sdh3
2 8 67 2 active sync /dev/sde3
3 8 83 3 active sync /dev/sdf3
4 8 51 4 active sync /dev/sdd3
8 8 99 5 active sync /dev/sdg3
6 8 147 6 active sync /dev/sdj3
12 8 19 7 active sync /dev/sdb3
11 8 163 8 active sync /dev/sdk3
10 8 35 9 active sync /dev/sdc3
bmxboy@bmxboy-virtual-machine:/$ dmesg | grep BTRFS
[ 17.026125] BTRFS: device label 2019.03.28-12:24:35 v23739 devid 1 transid 6011 /dev/dm-1
[ 168.013852] BTRFS info (device dm-1): using free space tree
[ 168.013855] BTRFS info (device dm-1): has skinny extents
[ 168.127156] BTRFS error (device dm-1): parent transid verify failed on 887020683264 wanted 6011 found 6270
[ 168.133110] BTRFS error (device dm-1): parent transid verify failed on 887020683264 wanted 6011 found 6270
[ 168.133118] BTRFS warning (device dm-1): failed to read tree root
[ 168.151448] BTRFS error (device dm-1): open_ctree failed
[ 8686.922437] BTRFS warning (device dm-1): 'recovery' is deprecated, use 'usebackuproot' instead
[ 8686.922439] BTRFS info (device dm-1): trying to use backup root at mount time
[ 8686.922441] BTRFS info (device dm-1): disabling free space tree
[ 8686.922444] BTRFS error (device dm-1): cannot disable free space tree
[ 8686.923395] BTRFS error (device dm-1): open_ctree failed
[ 9761.164452] BTRFS info (device dm-1): disabling free space tree
[ 9761.164455] BTRFS error (device dm-1): cannot disable free space tree
[ 9761.165254] BTRFS error (device dm-1): open_ctree failed
[14237.853328] BTRFS info (device dm-1): unrecognized mount option '0'
[14237.853528] BTRFS error (device dm-1): open_ctree failed
bmxboy@bmxboy-virtual-machine:/$ sudo btrfs fi show
Label: '2019.03.28-12:24:35 v23739' uuid: 90877621-a602-4915-914c-70eada4c3428
Total devices 1 FS bytes used 14.68TiB
devid 1 size 19.07TiB used 15.50TiB path /dev/mapper/vg1-volume_1
答案1
运行“btrfs-find-root /dev/vg1/volume_1&> /mnt/iscsi/btrfs-find-root &”
parent transid verify failed on 887020683264 wanted 6011 found 6270
Ignoring transid failure
Couldn't setup extent tree
Couldn't setup device tree
Superblock thinks the generation is 6011
Superblock thinks the level is 1
Found tree root at 887014998016 gen 6011 level 1
Well block 448900530176(gen: 7903 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 777465511936(gen: 7844 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 503614685184(gen: 7412 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 470875013120(gen: 7343 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 470870278144(gen: 7341 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 471096754176(gen: 7063 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 471050649600(gen: 6927 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 558475149312(gen: 6774 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 886999793664(gen: 6567 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 886999777280(gen: 6567 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 470921674752(gen: 6291 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887014064128(gen: 6269 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887014031360(gen: 6269 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887014014976(gen: 6269 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887013965824(gen: 6269 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887013326848(gen: 6268 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887013294080(gen: 6268 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887013244928(gen: 6268 level: 0) seems good, but generation/level doesn't match, want gen: 6011 level: 1
Well block 887010803712(gen: 6267 level: 1) seems good, but generation/level doesn't match, want gen: 6011 level: 1
........
答案2
运行 1.“vim /mnt/iscsi/btrfs-restore-from-tree.sh”（我觉得这个代码可能是错的???我不确定）
#!/bin/bash
for i in `tac /mnt/iscsi/btrfs-find-root | grep 'Well block' | awk '{print $3}' | sed "s/(.*$//"`; do echo "--- Well block $i ---"; btrfs restore -F -D -i -v -t $i /dev/vg1/volume_1 /dev/null 2>&1 | tee /mnt/iscsi/rest-btrfs-restore-wb-$i.1; done
~
2.“chmod +x /mnt/iscsi/btrfs-restore-from-tree.sh”
3.“/mnt/iscsi/btrfs-restore-from-tree.sh &> /mnt/iscsi/restored-from-tree &”
运行步骤1-3后，目录“/mnt/iscsi/”创建2000+++个文件，名称为“rest-btrfs-restore-wb***”
检查其中一个文件，我认为setp 1的代码可能是错误的???
bmxboy@bmxboy-virtual-machine:~$ cat /mnt/iscsi/rest-btrfs-restore-wb-503745953792.1
usage: btrfs restore [options] <device> <path> | -l <device>
Try to restore files from a damaged filesystem (unmounted)
-s|--snapshots get snapshots
-x|--xattr restore extended attributes
-m|--metadata restore owner, mode and times
-S|--symlink restore symbolic links
-v|--verbose verbose
-i|--ignore-errors ignore errors
-o|--overwrite overwrite
-t <bytenr> tree location
-f <bytenr> filesystem location
-u|--super <mirror> super mirror
-r|--root <rootid> root objectid
-d find dir
-l|--list-roots list tree roots
-D|--dry-run dry run (only list files that would be recovered)
--path-regex <regex>
restore only filenames matching regex,
you have to use following syntax (possibly quoted):
^/(|home(|/username(|/Desktop(|/.*))))$
-c ignore case (--path-regex only)