在学习CentOS 6.5 磁盘配额quotacheck命令这里，已经挂载分区到/home目录下，执行命令然后遇到错误提示，最后找到了原因，解决了问题。
解释：aquota.group与aqouta.user分别是组以及用户磁盘配额需要的配置文件。如果没有这两个文件，则磁盘配额是不会生效的。
执行命令
# quotacheck -augv123456789101112 [root@root ~]# quotacheck -augv
quotacheck: Your kernel probably supports journaled quota but you are not using it. Consider switching to journaled quota to avoid running quotacheck after an unclean shutdown.
quotacheck: Scanning /dev/sda6 [/home] done
quotacheck: Cannot stat old user quota file /home/aquota.user: No such file or directory. Usage will not be substracted.
quotacheck: Cannot stat old group quota file /home/aquota.group: No such file or directory. Usage will not be substracted.
quotacheck: Cannot stat old user quota file /home/aquota.user: No such file or directory. Usage will not be substracted.
quotacheck: Cannot stat old group quota file /home/aquota.group: No such file or directory. Usage will not be substracted.
quotacheck: Checked 4 directories and 6 files
quotacheck: Cannot create new quotafile /home/aquota.user.new: Permission denied
quotacheck: Cannot initialize IO on new quotafile: Permission denied
quotacheck: Cannot create new quotafile /home/aquota.group.new: Permission denied
quotacheck: Cannot initialize IO on new quotafile: Permission denied
[root@root ~]# ll /home/
total 24
drwx------. 2 root root 16384 Nov 25 16:07 lost+found
drwx------. 2 test1 test 4096 Nov 25 17:20 test1
drwx------. 2 513 513 4096 Nov 25 17:21 test2
出现上面的错误，提示不能创建/home/aquota.user /home/aquota.group 这2个文件，没有这个文件，没有权限操作。在home目录也没有发现这2个文件。
原因找到了，需要关闭selinux，然后就可以执行了。关闭selinux的命令是#setenforce 0
重新执行#quotacheck -auvg 就可以了，同样也会有错误提示，不用管他，之后在/home目录就有配置文件了。
[root@root ~]# quotacheck -avug
quotacheck: Your kernel probably supports journaled quota but you are not using it. Consider switching to journaled quota to avoid running quotacheck after an unclean shutdown.
quotacheck: Scanning /dev/sda6 [/home] done
quotacheck: Cannot stat old user quota file /home/aquota.user: No such file or directory. Usage will not be substracted.
quotacheck: Cannot stat old group quota file /home/aquota.group: No such file or directory. Usage will not be substracted.
quotacheck: Cannot stat old user quota file /home/aquota.user: No such file or directory. Usage will not be substracted.
quotacheck: Cannot stat old group quota file /home/aquota.group: No such file or directory. Usage will not be substracted.
quotacheck: Checked 4 directories and 6 files
quotacheck: Old file not found.
quotacheck: Old file not found.
[root@root ~]# ll /home/
total 40
-rw-------. 1 root root 8192 Nov 25 17:42 aquota.group
-rw-------. 1 root root 7168 Nov 25 17:42 aquota.user
drwx------. 2 root root 16384 Nov 25 16:07 lost+found
drwx------. 2 test1 test 4096 Nov 25 17:20 test1
drwx------. 2 513 513 4096 Nov 25 17:21 test2