This occurs under Centos indicate that the disk can only be read but not write, this happens because they do not usually normal shutdown or damaged hard disk mounted disk problems.
I tried a variety of command will not work, and finally with the mount -o remount rw / This command is solved.
Added: In addition to performing the above command, also need to be modified fatab file, otherwise there will be next reboot the above problems
Also you need to perform the following three commands;
vim / etc / fatab (fatab modified file or restore)
mount -a
reboot