Linux磁盘和文件系统管理(4)_文件系统属性查看 修改

文件系统属性查看及调整工具：

e2label命令：设置文件系统卷标，这样避免格式化修改卷标
e2label 设备名称 [Label]

#查看分区卷标
[root@localhost ~]# e2label /dev/sdb1
mytest

#修改分区卷标
[root@localhost ~]# e2label /dev/sdb1 'labelNew'
[root@localhost ~]# e2label /dev/sdb1
labelNew

tune2fs命令：显示ext系列文件系统的属性或修改其属性
语法：tune2fs [option] 设备名称
参数：
-l：显示super block中的信息
-j：将ext2文件系统转换为ext3文件系统，加入journal
-L ‘label’：类似e2label，分区卷标
-m #：调整预留给管理员的管理空间百分比
-O：文件系统属性的启动或关闭
[^]feature[,...]
-o：文件系统默认挂载选项的启用或关闭
[^]mount-option[,...]
man tune2fs查看详细的参数


示例：

[root@localhost ~]# tune2fs -l /dev/sdb1
tune2fs 1.42.9 (28-Dec-2013)
Filesystem volume name:   labelNew ------->卷标
Last mounted on:          /mnt/test3 ----->挂载点
Filesystem UUID:          e238f3ae-863c-473e-a1ca-35b1e0a69de2
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash
Default mount options:    user_xattr acl ----> 默认挂载选项
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              65536
Block count:              262144
Reserved block count:     13107
Free blocks:              249189
Free inodes:              65524
First block:              0
Block size:               4096
Fragment size:            4096
Group descriptor size:    64
Reserved GDT blocks:      127
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Tue Sep 15 05:53:15 2015
Last mount time:          Tue Sep 15 17:07:02 2015
Last write time:          Tue Sep 15 17:59:21 2015
Mount count:              9
Maximum mount count:      -1
Last checked:             Tue Sep 15 05:53:15 2015
Check interval:           0 (<none>)
Lifetime writes:          49 MB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:              256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      45da449e-ad33-4a49-9660-1469a94cc2f8
Journal backup:           inode blocks

#修改默认挂载选项：启用journal_data
[root@localhost ~]# tune2fs -o journal_data /dev/sdb1
tune2fs 1.42.9 (28-Dec-2013)
[root@localhost ~]# tune2fs -l /dev/sdb1
....
Default mount options:    journal_data user_xattr acl
....

dumpe2fs 命令：显示 ext2/ext3/ext4 文件系统信息
语法：dumpe2fs [option] DEVICE
参数：
-h: 仅显示超级块信息；
-b：显示坏块信息
-x：显示详细的组信息

示例：

[root@localhost ~]# dumpe2fs -x /dev/sdb1
dumpe2fs 1.42.9 (28-Dec-2013)
Filesystem volume name:   labelNew
...super block 信息...
Journal start:            0
Group 0: (Blocks 0x00000000-0x00007fff) [ITABLE_ZEROED]
Checksum 0xba41, unused inodes 8180
Primary superblock at 0x00000000, Group descriptors at 0x00000001-0x00000001
Reserved GDT blocks at 0x00000002-0x00000080
Block bitmap at 0x00000081 (+129), Inode bitmap at 0x00000091 (+145)
Inode table at 0x000000a1-0x000002a0 (+161)
28521 free blocks, 8180 free inodes, 2 directories, 8180 unused inodes
Free blocks: 0x0000008e-0x00000090, 0x00000099-0x000000a0, 0x000010a2-0x00007fff
Free inodes: 0x0000000d-0x00002000
...组信息...

如有错误，敬请指正！
谢谢！