Create raid1 under linux system-detailed steps

To create raid1 under the Linux system, a hot spare disk is required. After the Raid volume is created, the detailed information of the raid is displayed and the configuration is required

1：用fdisk工具对硬盘进行分区

2: Change the partition type to linuxraidauto type

3: Create md0 disk array, the type is raid1, the number of disks is 2, and the number of spare disks is 1

4: Permanently mount RAID

1. Obtain the UUID of the raid
   
   Note: The UUID registered by the device to the system
2. Start setting up mdadm.conf

5: Format

6: Get test information

Note: This UUID is a global UUID, used to uniquely represent this device

7: Set the startup item

8: Let /etc/fstab take effect

9: Test