How to configure RAID1 on CentOS 7

This video covers the method to configure RAID1 on CentOS 7. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks.
For more explanation on this video: https://www.linuxhelp.com/how-to-configure-raid1-on-centos-7/