这些步骤需要有管理员的权限。

步骤

1. 使用fdisk -l开查看但钱状态下磁盘情况

$ fdisk -l

Disk /dev/sda: 21.5 GB,21474836480 bytes,41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00085a0c

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     1026047      512000   83  Linux
/dev/sda2         1026048    41943039    20458496   8e  Linux LVM

# 注意看这里：这个就是新的硬盘
# 记下/dev/sdb这个名称
Disk /dev/sdb: 1073 MB,1073741824 bytes,2097152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-root: 18.8 GB,18756927488 bytes,36634624 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/centos-swap: 2147 MB,2147483648 bytes,4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

1. 使用过fdisk /dev/sdb来进行分区操作

$ fdisk /dev/sdb
# Command (m for Help): n //输入N表示新建一个分区
# Command (m for Help): w //保存分区

1. 再次fdisk -l查看信息

$ fdisk -l

1. 用mkfs.ext3格式化新分区

$ mkfs.ext3 /dev/sdb

1. 挂载使用

$ mkdir /mnt/hdb1 //新建一个挂载点。
$ mount /dev/hdb1 /mnt/hdb1 //挂载。
$ df -h

1. 开机自动挂载

在vi /etc/fstab中添加新硬盘的挂载信息，添加下面一行:
/dev/hdb1 /mnt/hdb1 ext3 defaults 1 2（如果还有一个分区就是1 3，以此类推)
这样,每次开机后,系统会自动将/dev/hdb1挂载到/mnt/hdb1

#
# /etc/fstab
# Created by anaconda on Tue May 10 23:34:03 2016
#
# Accessible filesystems,by reference,are maintained under '/dev/disk'
# See man pages fstab(5),findfs(8),mount(8) and/or blkid(8) for more info
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=d54493d2-18fd-4e43-b425-45dd790bdeaf /boot                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0

参考资料：

1. CentOS下添加新硬盘并分区格式化的详细步骤