条形时钟源码，可做柱状分析

异常：UNEXPECTED INCONSISTENCY:RUN fsck MANUALLY
场景说明：CentOS修复启动时根分区超级块错误的方案
Check filesystems

_Centos-6.5-x86_:Superblock last mount time
_Centos-6.5-x86_:UNEXPECTED INCONSISTENCY:RUN fsck MANUALLY
(i,e,without -a or -p options)

[FAILED]

*** An error occurred during the file system check
*** Dropping you to a sheell:the system will reboot
*** when you leave the shell
Give root password for maintenance
(or type Control-D to continue)
解决思路过程：
in blur, can not pay much attention to the error log info, just want to install once again

Now translate error info into Chinese : 检测文件系统的时候出现异常错误，提供控制台，当退出控制台的时候将会重启系统，键入密码进行维护****

Ok，now you have noticed how to get a shell to manintenance the filesystem
输入密码回车

df ,查看到当前的根文件系统已经挂载

怎么知道是根文件系统is broken,at the beginning ,I try to repair another data disk partition /dev/sdb1
Howerver ,even though reboot system ,occur the same problem once again.

try to umount root filesystem and fix it
umount /dev/sda2
But ,it is stubbon,I can not get rid of it from mounted point.

Give up all the considerations

fsck /dev/sda2
as a result ,the same problem occured once again

I doubt that it is not only /dev/sda2 partition ,but also /dev/sda1
fsck /dev/sda1

Yeah ,I got it