Install mdadm by entering the following commands in the terminal:
sudo apt update sudo apt install mdadm
Description:
tool to administer Linux MD arrays (software RAID)
The mdadm utility can be used to create, manage, and monitor MD (multi-disk) arrays for software RAID or multipath I/O. . This package automatically configures mdadm to assemble arrays during the system startup process. If not needed, this functionality can be disabled.
Homepage: http://neil.brown.name/blog/mdadm
Version: 4.0-2ubuntu1
Section: admin