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 tableBuilding a new DOS disklabel with disk identifier 0x001b1421.
Command (m for help): p
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x001b1421
Device Boot Start End Blocks Id System
Command (m for help): Command (m for help): nPartition type: p primary (0 primary, 0 extended, 4 free) e extendedSelect (default p): pPartition number (1-4, default 1): First sector (2048-41943039, default 2048): Using default value 2048Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039): Using default value 41943039Partition 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 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk identifier: 0x001b1421
Device Boot Start End Blocks Id System/dev/sdb1 2048 41943039 20970496 83 Linux
Command (m for help): tSelected partition 1Hex code (type L to list all codes): fdChanged type of partition 'Linux' to 'Linux raid autodetect'
Command (m for help): p
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectorsUnits = sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk label type: dosDisk 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