环境使用vmware的测试环境。
vmware工具下面增加应硬盘操作，简单操作，所需要的硬盘空间自己加，默认即可。
查看已经增加的新硬盘
fdisk /dev/sdb
(m进行操作)
输入n，p主分区，化到圆扇区到133,（4G总共522的扇区，每个1G都是133个扇区）
已经给磁盘划了主分区1，现在操作删除。（这里主要测试）
正常操作划分去（其实和windowns很像，主要是英文介绍。不懂就按M帮助操作即可）
Command (m for help): n 【选择分区】
Command action
e extended【扩展分区】
p primary partition (1-4)【主分区】
p【选择扇区类型】
Partition number (1-4): 1【选择分区号码】
First cylinder (1-522, default 1): 1
Last cylinder, +cylinders or +size{K,M,G} (1-522, default 522): 133【选择终止圆柱扇区】
Command (m for help): n
Command action
e extended
p primary partition (1-4)
e
Partition number (1-4): 1
Partition 1 is already defined. Delete it before re-adding it.
Command (m for help): n
Command action
e extended
p primary partition (1-4)
e
Partition number (1-4): 2
First cylinder (134-522, default 134):
Using default value 134
Last cylinder, +cylinders or +size{K,M,G} (134-522, default 522): 266
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
l
First cylinder (134-266, default 134): 134
Last cylinder, +cylinders or +size{K,M,G} (134-266, default 266): 266
Command (m for help): n
Command action
l logical (5 or over)【选择逻辑分区】
p primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (267-522, default 267):
Using default value 267
Last cylinder, +cylinders or +size{K,M,G} (267-522, default 522): 522
Command (m for help): w【写入分区】
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@localhost dev]#
用mkfs.ext2指令格式化主分区；（或者mkfs.ext4也可以-通用，版本升级）
一共对序号1.5主分区格式化、扩展分区序号2，逻辑分区序号3进行格式化。
[root@localhost dev]# mkdir /tmp/sdb{1,2,3,5} （创建文档）
[root@localhost dev]# mount /dev/sdb1 /tmp/sdb1 （挂载主分区，以及其他分区）
[root@localhost dev]# mount /dev/sdb2 /tmp/sdb2
mount: you must specify the filesystem type （#这是为什么挂载不了，是因为挂载挂在扩展分区中逻辑分区，扩展分区符号不能加入，系统提示定义你的文件系统类型。）还去网上找点资料补充，说怎么老是挂载不了上。
[root@localhost dev]# mount /dev/sdb3 /tmp/sdb3/
[root@localhost dev]# mount /dev/sdb5 /tmp/sdb5/
[root@localhost dev]# fdisk -l （使用fdisk指令看分区划分情况。）
Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 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: 0x00039fd9
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 5222 41430016 8e Linux LVM
Disk /dev/sdb: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 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: 0x59949818
Device Boot Start End Blocks Id System （第二个硬盘分区情况）
/dev/sdb1 1 133 1068291 83 Linux
/dev/sdb2 134 266 1068322+ 5 Extended
/dev/sdb3 267 522 2056320 83 Linux
/dev/sdb5 134 266 1068291 83 Linux
Disk /dev/mapper/VolGroup-LogVol01: 2000 MB, 2000683008 bytes
255 heads, 63 sectors/track, 243 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: 0x00000000
Disk /dev/mapper/VolGroup-LogVol00: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x00000000
Disk /dev/mapper/VolGroup-LogVol04: 8208 MB, 8208252928 bytes
255 heads, 63 sectors/track, 997 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: 0x00000000
Disk /dev/mapper/VolGroup-LogVol03: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x00000000
Disk /dev/mapper/VolGroup-LogVol02: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 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: 0x00000000
[root@localhost dev]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-LogVol00
9.8G 5.5G 3.8G 59% /
tmpfs 495M 80K 495M 1% /dev/shm
/dev/sda1 477M 29M 424M 7% /boot
/dev/mapper/VolGroup-LogVol02
9.8G 713M 8.6G 8% /home
/dev/mapper/VolGroup-LogVol03
9.8G 23M 9.2G 1% /opt
/dev/mapper/VolGroup-LogVol04
7.4G 37M 7.0G 1% /tmp
/dev/sdb1 1.1G 1.3M 974M 1% /tmp/sdb1 （每个分区的磁盘空间大小，和使用情况。）
/dev/sdb3 1.9G 3.0M 1.8G 1% /tmp/sdb3
/dev/sdb5 995M 1.3M 942M 1% /tmp/sdb5
[root@localhost dev]#
（参考帮助：https://blog.csdn.net/fanhuiren888/article/details/79291768）这个大师写的也很详细了。可以一起参考