https://www.jianshu.com/p/283bb84231ee
    https://tsov.net/uupee/25306/
    https://blog.csdn.net/weixin_29728529/article/details/116962544

    1. [root@KuaiCDN ~]# lsblk 
    2. NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
    3. sdf      8:80   0 931.5G  0 disk 
    4. sdd      8:48   0 931.5G  0 disk 
    5. sdb      8:16   0 931.5G  0 disk 
    6. sr0     11:0    1   2.1G  0 rom  /run/media/root/CDROM
    7. sde      8:64   0 931.5G  0 disk 
    8. sdc      8:32   0 931.5G  0 disk 
    9. sda      8:0    0 232.9G  0 disk 
    10. ├─sda4   8:4    0     1K  0 part 
    11. ├─sda2   8:2    0   512M  0 part /boot
    12. ├─sda5   8:5    0 232.3G  0 part /
    13. ├─sda3   8:3    0    64M  0 part /boot/efi
    14. └─sda1   8:1    0     2M  0 part 
    15. [root@KuaiCDN ~]# 
    16. [root@KuaiCDN ~]# 
    17. [root@KuaiCDN ~]# 
    18. [root@KuaiCDN ~]# 
    19. [root@KuaiCDN ~]# mdadm -Cv /dev/md10 -a yes -n 4 -l 10 -x 1 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf
    20. mdadm: layout defaults to n2
    21. mdadm: layout defaults to n2
    22. mdadm: chunk size defaults to 512K
    23. mdadm: size set to 976630272K
    24. mdadm: automatically enabling write-intent bitmap on large array
    25. mdadm: Defaulting to version 1.2 metadata
    26. mdadm: array /dev/md10 started.
    27. [root@KuaiCDN ~]#