Note: besure to replace /dev/sdb with the correct location of the data disk.
sudo apt update
sudo apt install dosfstools
sudo mkfs -t ext4 /dev/sdb
sudo mount /dev/sdb /mnt/mariadb-data
sudo apt install mariadb-server
sudo systemctl stop mariadb
sudo cp -R -p /var/lib/mysql/* /mnt/mariadb-data
sudo cp /etc/mysql/mariadb.conf.d/50-server.cnf /etc/mysql/mariadb.conf.d/50-server.cnf.backup
sudo sed -i ‘s/\/var\/lib\/mysql/\/mnt\/mariadb-data/g; s/bind-address\s*=\s*127\.0\.0\.1/bind-address = 0.0.0.0/g’ /etc/mysql/mariadb.conf.d/50-server.cnf.backup2
sudo systemctl start mariadb
sudo systemctl enable mariadb