MS HyperV 환경에서 VM으로 실행되는 SLES12 SP1 시스템이 있습니다.
재부팅 후 vmlinux가 더 이상 없기 때문에 시스템이 더 이상 부팅되지 않습니다. Grub은 "리눅스 커널을 먼저로드해야한다"고 말합니다 (정확한 오류 메시지를 복사 할 수 없었습니다). 더 깊이 파고 더 오래된 커널을로드하려고 시도한 후에도 여전히 btrfs 시스템에 트랜잭션이 걸려 있음을 깨달았습니다. 적어도 체크섬이 손상되었습니다.
최신 OpenSUSE Rescue CD를 다운로드하여 장치를 마운트하려고했습니다. 홈 파티션을 마운트 할 수 있지만 / boot 등이있는 파티션은 마운트되지 않습니다.
linux@localhost:~> sudo mount -t btrfs -o ro,usebackuproot /dev/sda2 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sda2, missing codepage or helper program, or other error.
따라서 다음 단계를 수행했습니다. https://lists.opensuse.org/opensuse/2017-02/msg00930.html
마운트가 전혀 작동하지 않습니다. 캐시 비활성화 등의 다른 옵션을 시도 했으므로 스크러빙도 작동하지 않았습니다.
btrfs check는 말한다 :
linux@localhost:~> sudo btrfs check /dev/sda2
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found E4E3BDB6 wanted 00000000
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
bytenr mismatch, want=75659116544, have=5432601639048425051
ERROR: cannot open file system
복원도 작동하지 않습니다 :
linux@localhost:~> sudo btrfs restore /dev/sda2 /run/media/linux/c03ad26a-a896-468d-bf9d-9953f87b2661/Administrator/Backup_sda2/
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found E4E3BDB6 wanted 00000000
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
bytenr mismatch, want=75659116544, have=5432601639048425051
Could not open root, trying backup super
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found E4E3BDB6 wanted 00000000
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
bytenr mismatch, want=75659116544, have=5432601639048425051
Could not open root, trying backup super
ERROR: superblock bytenr 274877906944 is larger than device size 42952818688
Could not open root, trying backup super
그래서 dd를 사용하여 이미지를 백업했습니다.
최고 회복 :
linux@localhost:~> sudo btrfs rescue super-recover /dev/sda2
All supers are valid, no need to recover
btrfs 구조 제로 로그 :
linux@localhost:~> sudo btrfs rescue zero-log /dev/sda2
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found E4E3BDB6 wanted 00000000
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
bytenr mismatch, want=75659116544, have=5432601639048425051
ERROR: could not open ctree
청크 복구도 작동하지 않았지만 나중에 마운트하려고했습니다.
linux@localhost:~> sudo btrfs rescue chunk-recover /dev/sda2
Scanning: DONE in dev0
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found E4E3BDB6 wanted 00000000
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
bytenr mismatch, want=75659116544, have=5432601639048425051
open with broken chunk error
Chunk tree recovery failed
linux@localhost:~> sudo mount -t btrfs -o ro,usebackuproot /dev/sda2 /mnt
mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sda2, missing codepage or helper program, or other error.
수리 점검 :
linux@localhost:~> sudo btrfs check --repair /dev/sda2
enabling repair mode
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found E4E3BDB6 wanted 00000000
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
bytenr mismatch, want=75659116544, have=5432601639048425051
ERROR: cannot open file system
init-extent-tree와 같은 오류가 발생합니다.
linux@localhost:~> sudo btrfs check --repair --init-extent-tree /dev/sda2
enabling repair mode
Checking filesystem on /dev/sda2
UUID: b70dc1a4-4c19-446c-98c9-eeee88c4fd47
Creating a new extent tree
checksum verify failed on 75638358016 found 9B64BB37 wanted 6156F702
checksum verify failed on 75638358016 found 9B64BB37 wanted 6156F702
checksum verify failed on 75638358016 found E4E3BDB6 wanted 00000000
checksum verify failed on 75638358016 found 9B64BB37 wanted 6156F702
bytenr mismatch, want=75638358016, have=267958633426704061
Error reading tree block
error pinning down used bytes
ERROR: attempt to start transaction over already running one
extent buffer leak: start 89771360256 len 16384
또한 init-csum-tree :
linux@localhost:~> sudo btrfs check --repair --init-csum-tree /dev/sda2
enabling repair mode
Creating a new CRC tree
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
checksum verify failed on 75659116544 found E4E3BDB6 wanted 00000000
checksum verify failed on 75659116544 found 61415E80 wanted 96E73A64
bytenr mismatch, want=75659116544, have=5432601639048425051
ERROR: cannot open file system
이 오류에 대한 추가 정보를 찾지 못해 스택 교환에 대한 도움을 얻으려고 노력하고 있습니다.이 주제에 대한 Q & A가 이미 있음을 알고 있습니다. 우리는 호스트 서버의 백업 만 가지고 있으므로이 서버를 실제로 실행하고 싶습니다. btrfs 파티션을 복구하는 더 좋은 방법이 있어야합니다. (
미리 감사드립니다!