linux tune2fs命令详解
一.简介：
tune2fs是调整和查看ext2/ext3文件系统的文件系统参数，Windows下面如果出现意外断电死机情况，下次开机一般都会出现系统自检。Linux系统下面也有文件系统自检，而且是可以通过tune2fs命令，自行定义自检周期及方式。
二.用法：
Usage: tune2fs [-c max_mounts_count] [-e errors_behavior] [-g group]
[-i interval[d|m|w]] [-j] [-J journal_options] [-l]
[-m reserved_blocks_percent] [-o [^]mount_options[,...]]
[-r reserved_blocks_count] [-u user] [-C mount_count] [-L volume_label]
[-M last_mounted_dir] [-O [^]feature[,...]]
[-E extended-option[,...]] [-T last_check_time] [-U UUID]
[ -I new_inode_size ] device
常用选项说明：
-l 查看文件系统信息
-c max-mount-counts 设置强制自检的挂载次数，如果开启，每挂载一次mount conut就会加1，超过次数就会强制自检
-i interval-between-checks[d|m|w] 设置强制自检的时间间隔[d天m月w周]
-m reserved-blocks-percentage 保留块的百分比
-j 将ext2文件系统转换为ext3类型的文件系统
-L volume-label 类似e2label的功能，可以修改文件系统的标签
-r reserved-blocks-count 调整系统保留空间
-o [^]mount-option[,...] Set or clear the indicated default mount options in the filesystem. 设置或清除默认挂载的文件系统选项
三.例如：
tune2fs -c 30 /dev/hda1 设置强制检查前文件系统可以挂载的次数
tune2fs -c -l /dev/hda1 关闭强制检查挂载次数限制。
tune2fs -i 10 /dev/hda1 10天后检查
tune2fs -i 1d /dev/hda1 1天后检查
tune2fs -i 3w /dev/hda1 3周后检查
tune2fs -i 6m /dev/hda1 半年后检查
tune2fs -i 0 /dev/hda1 禁用时间检查
tune2fs -j /dev/hda1 添加日志功能，将ext2转换成ext3文件系统
tune2fs -r 40000 /dev/hda1 调整/dev/hda1分区的保留空间为40000个磁盘块
tune2fs -o acl,user_xattr /dev/hda1 设置/dev/hda1挂载选项，启用Posix Access Control Lists和用户指定的扩展属性
开机取消自检:
tune2fs -l /dev/sdb1 | grep -E ‘Maximum mount count:|Check interval’
tune2fs -i 0 -c 0 /dev/sdb1
[email protected]:~$ tune2fs -l /dev/sda4
tune2fs 1.41.12 (17-May-2010)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 0db8fb3c-b919-4438-81ea-3b82aa9b1ef3
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal filetype needs_recovery sparse_super
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 32358400
Block count: 64713472
Reserved block count: 3235673
Free blocks: 63665256
Free inodes: 32358385
First block: 0
Block size: 4096（单位为byte）
Fragment size: 4096
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 16384
Inode blocks per group: 512
Filesystem created: Fri Aug 29 21:29:02 2014
Last mount time: Fri Aug 29 13:58:48 2014
Last write time: Fri Aug 29 13:58:48 2014
Mount count: 3
Maximum mount count: 32
Last checked: Fri Aug 29 21:29:02 2014
Check interval: 15552000 (6 months)
Next check after: Wed Feb 25 21:29:02 2015
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
First orphan inode: 9912479
Default directory hash: tea
Directory Hash Seed: 93afb278-d55c-4b62-814c-7908c3264b55
Journal backup: inode blocks
转载：http://blog.chinaunix.net/uid-7530389-id-2050094.html