tune2fs

tune2fs功能说明：调整ext2/ext3/ext4文件系统参数
tune2fs命令可以调整或查看ext2/ext3/ext4文件系统的参数，比如可以调整Linux文件系统开机自检的周期。

参数选项
-c    设置强制自检的挂载次数，每挂载一次计数就会加1，超过次数就会强制自检。设置为0或-1则此功能关闭
-C    设置文件系统已经被挂载的次数
-i    设置强制自检的时间间隔（天、周、月）
-j    将ext2文件系统转换为ext3类型的文件系统
-l    查看文件系统信息



范例：查看文件系统挂载信息
[root@cs6 ~]# tune2fs -l /dev/sda1|grep -i Mount
Last mounted on:          /boot    #<==查看sda1设备即/boot分区的挂载次数。
Default mount options:    user_xattr acl
Last mount time:          Sat May 11 07:27:26 2019    #<=示上次挂载时间。
Mount count:              8        #<==挂载的次数。
Maximum mount count:      -1       #<==强制自检的挂载次数为-1，关闭自检功能。
[root@cs6 ~]# tune2fs -l /dev/sdb1|grep -i Mount
Last mounted on:          <not available>
Default mount options:    (none)
Last mount time:          Sat May 11 07:55:48 2019
Mount count:              1
Maximum mount count:      -1



范例：设置挂载次数
[root@cs6 ~]# tune2fs -C 30 /dev/sdb1    #<==参数 -C 设置文件系统已经被挂载的决数。
tune2fs 1.41.12 (17-May-2010)
Setting current mount count to 30
 
[root@cs6 ~]# tune2fs -l /dev/sdb1 |grep -i Mount
Last mounted on:          <not available>
Default mount options:    (none)
Last mount time:          Sat May 11 07:55:48 2019
Mount count:              30
Maximum mount count:      -1 



范例：设置强制自检的挂载次数
[root@cs6 ~]# tune2fs -c 40 /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Setting maximal mount count to 40
[root@cs6 ~]# tune2fs -l /dev/sda1| grep -i Mount
Last mounted on:          /boot
Default mount options:    user_xattr acl
Last mount time:          Sat May 11 07:27:26 2019
Mount count:              8
Maximum mount count:      40
[root@cs6 ~]# tune2fs -c -1 /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Setting maximal mount count to -1
[root@cs6 ~]# tune2fs -l /dev/sda1| grep -i Mount
Last mounted on:          /boot
Default mount options:    user_xattr acl
Last mount time:          Sat May 11 07:27:26 2019
Mount count:              8
Maximum mount count:      -1  



范例：设置强制自检的时间间隔
[root@cs6 ~]# tune2fs -l /dev/sda1 |grep -i check      #<==查看检查周期。
Last checked:             Sun May  5 23:10:27 2019
Check interval:           0 (<none>)        #<==系统分区默认不检查。
[root@cs6 ~]# tune2fs -i 10 /dev/sda1       #<==参数 -i 设置每10天检查一次。
tune2fs 1.41.12 (17-May-2010)
Setting interval between checks to 864000 seconds
 
[root@cs6 ~]# tune2fs -l  /dev/sda1|grep -i check
Last checked:             Sun May  5 23:10:27 2019
Check interval:           864000 (1 week, 3 days)    #<==这里变成10天，864000秒。
Next check after:         Wed May 15 23:10:27 2019
 
[root@cs6 ~]# tune2fs -i 0 /dev/sda1    #还原正常状态
tune2fs 1.41.12 (17-May-2010)
Setting interval between checks to 0 seconds
[root@cs6 ~]# tune2fs -l  /dev/sda1|grep -i check
Last checked:             Sun May  5 23:10:27 2019
Check interval:           0 (<none>)