Linux tune2fs命令

Linux tune2fs命令：显示和调整文件系统参数。

Linux tune2fs命令 功能描述

使用tune2fs命令可以查看和调整文件系统的参数。

Linux tune2fs命令 语法

tune2fs [选项] [设备]

命令中各选项的含义如表所示。

Linux tune2fs命令 示例

查看/dev/sda1设备的文件系统信息

[root@rhel ～]# tune2fs -l /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Filesystem volume name:  <none>
Last mounted on:         /boot
Filesystem UUID:         bec50cdd-090c-47ad-83d5-25328b4ab8ec
Filesystem magic number:  0xEF53
Filesystem revision#:   1(dynamic)
Filesystem features:     has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:       signed_directory_hash
Default mount options:   user_xattr acl
Filesystem state:       clean
Errors behavior:         Continue
Filesystem OS type:      Linux
Inode count:            25688
Block count:            102400
Reserved block count:    5120
Free blocks:            70259
Free inodes:            25650
First block:            1
Block size:            1024
Fragment size:          1024
Reserved GDT blocks:    256
Blocks per group:       8192
Fragments per group:     8192
Inodes per group:       1976
Inode blocks per group:  247
Flex block group size:   16
Filesystem created:      Sun Aug 18 21:25:032013
Last mount time:          Mon Aug 19 00:45:082013
Last write time:         Mon Aug 19 00:45:082013
Mount count:            2
Maximum mount count:     -1
Last checked:           Sun Aug 18 21:25:032013
Check interval:         0(<none>)
Lifetime writes:         30 MB
Reserved blocks uid:     0(user root)
Reserved blocks gid:     0(group root)
First inode:            11
Inode size:             128
Journal inode:          8
Default directory hash:  half_md4
Directory Hash Seed:     d66696fd-086f-4beb-87f0-924ac63fd65d
Journal backup:         inode blocks

设置系统在达到时间间隔3天时自动检查磁盘分区/dev/sda1文件系统

[root@rhel ～]# tune2fs -i 3d /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Setting interval between checks to 259200 seconds

禁用按时间间隔自动检查磁盘分区/dev/sda1文件系统

[root@rhel ～]# tune2fs -i 0 /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Setting interval between checks to 0 seconds

设置强制检查磁盘分区/dev/sda1文件系统前文件系统可挂载的次数为100次

[root@rhel ～]# tune2fs -c 100 /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Setting maximal mount count to 100

关闭磁盘分区/dev/sda1文件系统检查前的挂载次数限制

[root@rhel ～]# tune2fs -c 0 /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Setting maximal mount count to -1

设置/dev/sda1设备保留块的百分比为15%

[root@rhel ～]# tune2fs -m 15 /dev/sda1
tune2fs 1.41.12 (17-May-2010)
Setting reserved blocks percentage to 15% (15360 blocks)

设置/dev/sda1设备的卷标为boot

[root@rhel ～]# tune2fs -L boot /dev/sda1
tune2fs 1.41.12 (17-May-2010)

查看/dev/sda1分区的块大小

[root@rhel ～]# tune2fs -l /dev/sda1|grep ''Block size''
Block size: 1024
//可以看到/dev/sda1分区的块大小（Block size）为1024字节，也就是1KB

查看/dev/sda1分区的UUID

[root@rhel ～]# tune2fs -l /dev/sda1 |grep 'UUID'
Filesystem UUID:         bec50cdd-090c-47ad-83d5-25328b4ab8ec