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标题：mount: wrong fs type, bad option, bad superblock恢复Oracle

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

有朋友找到我们,说对lv进行收缩操作之后,导致文件系统无法mount,提示超级块损坏.
尝试mount失败

[root@GZGSDB data]# mount /dev/vg_gzgsdb/lv_home /home
mount: wrong fs type, bad option, bad superblock on /dev/mapper/vg_gzgsdb-lv_home,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

系统日志报错

Aug 16 21:23:24 GZGSDB kernel: EXT4-fs (dm-5): ext4_check_descriptors: Block bitmap for group 1 not in group (block 0)!
Aug 16 21:23:24 GZGSDB kernel: EXT4-fs (dm-5): group descriptors corrupted!

主要操作

[root@GZGSDB dul]# dumpe2fs /dev/vg_gzgsdb/lv_home |grep superblock
dumpe2fs 1.41.12 (17-May-2010)
ext2fs_read_bb_inode: A block group is missing an inode table 
  Primary superblock at 0, Group descriptors at 1-52
  Backup superblock at 32768, Group descriptors at 32769-32820
  Backup superblock at 98304, Group descriptors at 98305-98356
  Backup superblock at 163840, Group descriptors at 163841-163892
  Backup superblock at 229376, Group descriptors at 229377-229428
  Backup superblock at 294912, Group descriptors at 294913-294964
  Backup superblock at 819200, Group descriptors at 819201-819252
  Backup superblock at 884736, Group descriptors at 884737-884788
  Backup superblock at 1605632, Group descriptors at 1605633-1605684
  Backup superblock at 2654208, Group descriptors at 2654209-2654260
  Backup superblock at 4096000, Group descriptors at 4096001-4096052
  Backup superblock at 7962624, Group descriptors at 7962625-7962676
  Backup superblock at 11239424, Group descriptors at 11239425-11239476
  Backup superblock at 20480000, Group descriptors at 20480001-20480052
  Backup superblock at 23887872, Group descriptors at 23887873-23887924
  Backup superblock at 71663616, Group descriptors at 71663617-71663668
  Backup superblock at 78675968, Group descriptors at 78675969-78676020
  Backup superblock at 102400000, Group descriptors at 102400001-102400052
  Backup superblock at 214990848, Group descriptors at 214990849-214990900

使用fsck修复

[root@GZGSDB data]# fsck -y /dev/vg_gzgsdb/lv_home 
fsck from util-linux-ng 2.17.2
e2fsck 1.41.12 (17-May-2010)
fsck.ext4: Group descriptors look bad... trying backup blocks...
fsck.ext4: The ext2 superblock is corrupt when using the backup blocks
fsck.ext4: going back to original superblock
fsck.ext4: Device or resource busy while trying to open /dev/mapper/vg_gzgsdb-lv_home
Filesystem mounted or opened exclusively by another program?
--指定超级块恢复
[root@GZGSDB data]# fsck -y -b 102400000 /dev/vg_gzgsdb/lv_home 
…………
Illegal block #0 (1296647770) in inode 354315.  CLEARED.
Illegal block #1 (1398362886) in inode 354315.  CLEARED.
Illegal block #3 (453538936) in inode 354315.  CLEARED.
Illegal block #5 (808333361) in inode 354315.  CLEARED.
Illegal block #6 (775434798) in inode 354315.  CLEARED.
Illegal block #8 (1180306180) in inode 354315.  CLEARED.
Illegal block #9 (1413893971) in inode 354315.  CLEARED.
Illegal block #10 (1229347423) in inode 354315.  CLEARED.
Illegal block #11 (1498613325) in inode 354315.  CLEARED.
Illegal indirect block (1296389203) in inode 354315.  CLEARED.
Inode 354315 is too big.  Truncate? yes

Block #1074301965 (69632) causes directory to be too big.  CLEARED.
Warning... fsck.ext4 for device /dev/mapper/vg_gzgsdb-lv_home exited with signal 11.

[root@GZGSDB data]# mount /dev/vg_gzgsdb/lv_home /home
mount: wrong fs type, bad option, bad superblock on /dev/mapper/vg_gzgsdb-lv_home,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

至此基本上可以判断,直接修复该文件系统,让其正常mount的概率很小.直接通过lun层面来恢复.

通过工具解析lun