骤1：添加两块大小相同 的磁盘
查看磁盘是否添加成功：lsblk
查看磁盘是否为raid格式
步骤2：/dev/sdb创建分区并且修改分区类型为raid fd
[root@localhost ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x001b1421.
Command (m for help): p
Disk /dev/sdb: 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: 0x001b1421
Device Boot Start End Blocks Id System
Command (m for help):
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039):
Using default value 41943039
Partition 1 of type Linux and of size 20 GiB is set
Command (m for help): p
Disk /dev/sdb: 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: 0x001b1421
Device Boot Start End Blocks Id System
/dev/sdb1 2048 41943039 20970496 83 Linux
Command (m for help): t
Selected partition 1
Hex code (type L to list all codes): fd
Changed type of partition 'Linux' to 'Linux raid autodetect'
Command (m for help): p
Disk /dev/sdb: 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: 0x001b1421
Device Boot Start End Blocks Id System
/dev/sdb1 2048 41943039 20970496 fd Linux raid autodetect
（2）/dev/sdc的创建分区并且修改分区类型为raid fd的步骤跟上面一样
（3）分区后查看结果：检查分区是否为raid类型
步骤3：创建raid1：mdadm -C -v /dev/md1 -l 1 -n 2 /dev/sd[b-c]1
查看raid1的详细信息
步骤4：格式化并挂载设备
步骤5：设置开机自动挂载
步骤6：生成raid的配置文件
步骤7：测试：创建一个test.txt的文件
模拟坏掉一块盘mdadm /dev/md1 -f /dev/sdc1
查看详细信息并查看test.txt文件
出现如图所示表明raid1已经创建成功了