极客笔记Linux dumpe2fs命令：查看文件系统信息。
Linux dumpe2fs命令 功能描述
使用dumpe2fs命令可以查看文件系统的相关信息，特别是超级块的信息。
Linux dumpe2fs命令 语法
dumpe2fs [选项] [设备]
命令中各选项的含义如表所示。
Linux dumpe2fs命令 示例
查看/dev/sda1设备的超级块信息
[root@rhel ～]# dumpe2fs -h /dev/sda1
dumpe2fs 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
Journal features: (none)
日志大小： 4096k
Journal length: 4096
Journal sequence: 0x00000019
Journal start: 0
查看/dev/sda1分区的UUID
[root@rhel ～]# dumpe2fs /dev/sda1 |grep 'UUID'
dumpe2fs 1.41.12 (17-May-2010)
Filesystem UUID: bec50cdd-090c-47ad-83d5-25328b4ab8ec