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fdisk 文本界面增删改分区
磁盘分区：fdisk 命令
[root@lob1 /]# df / 《==查看磁盘文件名
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup-lv_root
19235284 1179492 17078692 7% /
[root@lob1 /]# fdisk /dev/sda 《==磁盘分区格式 ,我的机器是sda硬盘模式
WARNING: DOS-compatible mode is deprecated. It‘s strongly recommended to
switch off the mode (command ‘c‘) and change display units to
sectors (command ‘u‘).
Command (m for help): m 《==输入m后，可以看到下面这些命令
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition 《==删除一个分区
l list known partition types
m print this menu
n add a new partition 《==新增一个分区
o create a new empty DOS partition table
p print the partition table 《==再屏幕上显示分区表
q quit without saving changes 《==不储存，离开fdisk程序
s create a new empty Sun disklabel
t change a partition‘s system id
u change display/entry units
v verify the partition table
w write table to disk and exit 《= 将刚才的操作写入分区表，保存退出。
x extra functionality (experts only)
Command (m for help): p 《==再屏幕上显示分区表
Disk /dev/sda: 21.6 GB, 21580873728 bytes
255 heads, 63 sectors/track, 2623 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000e6242
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 2624 20561920 8e Linux LVM
Command (m for help): d 《==删除第一个分区
Partition number (1-4): 1
Command (m for help): p 《==再屏幕上显示分区表
Disk /dev/sda: 21.6 GB, 21580873728 bytes
255 heads, 63 sectors/track, 2623 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000e6242
Device Boot Start End Blocks Id System
/dev/sda2 64 2624 20561920 8e Linux LVM
Command (m for help): d 《==删除第二个分区
Selected partition 2
Command (m for help): 2
2: unknown command
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition‘s system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): p 《==再屏幕上显示分区表
Disk /dev/sda: 21.6 GB, 21580873728 bytes
255 heads, 63 sectors/track, 2623 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000e6242
Device Boot Start End Blocks Id System
Command (m for help): n 《==新增一个分区
Command action
e extended
p primary partition (1-4)
p 《==新增主分区
Partition number (1-4): 1 《==新增名称为“1”的主分区
First cylinder (1-2623, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2623, default 2623): +512M 《==设置“1”的主分区的大小
格式 “+XXXM，+ 连字符 ，XXX代表数字，M是大小，个人理解”
Command (m for help): p
Disk /dev/sda: 21.6 GB, 21580873728 bytes
255 heads, 63 sectors/track, 2623 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000e6242
Device Boot Start End Blocks Id System
/dev/sda1 1 66 530113+ 83 Linux
Command (m for help): n 《==显示分区表
e extended
p primary partition (1-4)
p 《==新增的是主分区
Partition number (1-4): 2 《==新增名字为“2”的主分区
First cylinder (67-2623, default 67):
Using default value 67
Last cylinder, +cylinders or +size{K,M,G} (67-2623, default 2623): +512M 《==设置“2”的主分区的大小
Command (m for help): n
Command action
e extended
p primary partition (1-4)
e 《==新增的是扩展分区
Partition number (1-4): 3 《==新增名字为“3”的扩展分区
First cylinder (133-2623, default 133):
Using default value 133
Last cylinder, +cylinders or +size{K,M,G} (133-2623, default 2623): 《==不写代表是默认，直接enter默认下一步，剩余所有空间全部分配给扩展分区“3”
Using default value 2623
Command (m for help): p 《==查看分区列表
Disk /dev/sda: 21.6 GB, 21580873728 bytes
255 heads, 63 sectors/track, 2623 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000e6242
Device Boot Start End Blocks Id System
/dev/sda1 1 66 530113+ 83 Linux
/dev/sda2 67 132 530145 83 Linux
/dev/sda3 133 2623 20008957+ 5 Extended
Command (m for help): n 《==新增一个分区
Command action
l logical (5 or over)
p primary partition (1-4)
p 《==新增主分区
Selected partition 4
No free sectors available 《==没有空余空间不能新增主分区
Command (m for help): n 《新增一个分区
Command action
l logical (5 or over)
p primary partition (1-4)
l 《==新增逻辑分区，因为是PPE已经分配完所有空间，如果再分配新区只能是L 逻辑分区
First cylinder (133-2623, default 133):
Using default value 133
Last cylinder, +cylinders or +size{K,M,G} (133-2623, default 2623): 512 《==逻辑分区大小
Command (m for help): p 《==查看分区列表
Disk /dev/sda: 21.6 GB, 21580873728 bytes
255 heads, 63 sectors/track, 2623 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000e6242
Device Boot Start End Blocks Id System
/dev/sda1 1 66 530113+ 83 Linux
/dev/sda2 67 132 530145 83 Linux
/dev/sda3 133 2623 20008957+ 5 Extended
/dev/sda5 133 512 3052318+ 83 Linux 《==逻辑分区默认为5，柱面在3扩展分区之内
Command (m for help): q 《==因为是测试所有按“q” 不保存退去。如果是正式的话则按“w”保存退出
[root@lob1 /]#
fdisk 文本界面增删改分区