启动时候出现错误。

好好的系统突然启动时出现了

***an error occurred during the file system check
***Dropping you to a shell;thesystem will reboot
***when you leave the shell.
Give root password for mainteance
(or type Control -D for normal startup)

是文件系统出了错误。用fsck进行回复，刚开始使用-a选项，没有成功，后来仔细看了出错提示，

解决方法，root密码

于是检查逻辑卷，提示：

# fsck.ext3 -f /dev/mapper/test-test
e2fsck 1.38 (30-Jun-2005)
fsck.ext3: Attempt to read block from filesystem resulted in short read while trying to open /dev/mapper/test-test
Could this be a zero-length partition?

然后，查看了一下这个逻辑卷的信息：

# mkfs.ext3 -n /dev/mapper/test-test
mke2fs 1.38 (30-Jun-2005)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
6553600 inodes, 13107200 blocks
655360 blocks (5.00%) reserved for the super user
First data block=0
400 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424

然后，尝试了一下，用备用超级块来修复：

# fsck.ext3 -b 163840 /dev/mapper/test-test
e2fsck 1.38 (30-Jun-2005)
fsck.ext3: Attempt to read block from filesystem resulted in short read while trying to open /dev/mapper/test-test
Could this be a zero-length partition?

结果仍然报错。那就再试试重启lvm服务吧，执行

/etc/init.d/lvm stop

/etc/init.d/lvm start

然后再执行：

# fsck.ext3 -b 163840 /dev/mapper/test-test
e2fsck 1.38 (30-Jun-2005)
ext3 recovery flag is clear, but journal has data.
Recovery flag not set in backup superblock, so running journal anyway.
/dev/mapper/test-test: recovering journal
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

/dev/mapper/test-test: ***** FILE SYSTEM WAS MODIFIED *****
/dev/mapper/test-test: 31/6553600 files (3.2% non-contiguous), 1823265/13107200 blocks

执行/etc/init.d/checkfs.sh start，也可检查、修复文件系统。

执行

(Repair filesystem)# fdisk -l 查看所有的/dev

之后依次 :
(Repair filesystem)#fsck -y /dev/sda2
(Repair filesystem)#fsck -y /dev/sda3
(Repair filesystem)#fsck -y /dev/sda4
(Repair filesystem)#fsck -y /dev/sda5

说可以尝试用不带-a或-p的fsck，过程中会让你选择几个yes/no，是关于文件块修复的，都选yes就可以了，成功。

以后要养成正常关机的好习惯。。

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