superblock 故障修复 (redhat 6 )

使用 网站提供UBCD V5.x光盘中的Parted Magic，引导故障系统
查看LV卷信息
# lvdisplay
  --- Logical volume ---
  LV Name                /dev/vg_ftpsvr/lv_root
  VG Name                vg_ftpsvr
  LV UUID                IKz8zV-EqU0-8ECJ-nsOn-zHJk-F7Ep-Vvbs9b
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                31.45 GB
  Current LE             8052
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:0
  
# lvscan
  ACTIVE            '/dev/vg_ftpsvr/lv_root' [31.45 GB] inherit
  ACTIVE            '/dev/vg_ftpsvr/lv_swap' [1.97 GB] inherit  

# mount /dev/vg_ftpsvr/lv_root   /tmp
mount: wrong fs type, bad option, bad superblock on /dev/mapper/vg_ftpsvr-lv_root,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

# dmesg |tail -n 20
EXT4-fs (cciss!c0d0p1): mounted filesystem with ordered data mode
JBD: barrier-based sync failed on cciss!c0d0p1-8 - disabling barriers
cciss: cmd f6600000 has CHECK CONDITION sense key = 0x3
end_request: I/O error, dev cciss/c0d0, sector 30691240
JBD: Failed to read block at offset 5109
JBD: recovery failed
EXT4-fs (dm-0): error loading journal

修复EXT4-fs文件系统

# fsck.ext4   /dev/vg_ftpsvr/lv_root  
e2fsck 1.41.11 (14-Mar-2010)
/dev/vg_ftpsvr/lv_root: recovering journal
Error reading block 3707908 (Attempt to read block from filesystem resulted in short read).  Ignore error? yes
 
Force rewrite? yes
 
Clearing orphaned inode 393223 (uid=27, gid=27, mode=0100600, size=0)
Clearing orphaned inode 393222 (uid=27, gid=27, mode=0100600, size=0)
Clearing orphaned inode 393221 (uid=27, gid=27, mode=0100600, size=0)
Clearing orphaned inode 393220 (uid=27, gid=27, mode=0100600, size=0)
Clearing orphaned inode 393219 (uid=27, gid=27, mode=0100600, size=0)
/dev/vg_ftpsvr/lv_root: clean, 122727/2064384 files, 1079905/8245248 blocks

# mount /dev/vg_ftpsvr/lv_root   /tmp
# ls
bin/        dev/        lost+found/ net/        sbin/       sys/
boot/       etc/        media/      opt/        selinux/    tmp/
cgroup/     home/       misc/       proc/       sofware/    usr/
data/       lib/        mnt/        root/       srv/        var/