sudo fdisk -l
df -Th /
sudo mkfs.xfs /dev/sdb
sudo mkdir /mnt/tmp
sudo mount /dev/sdX1 /mnt/tmp
sudo rsync -avxHAX --progress /var/* /mnt/tmp
sudo blkid /dev/sdb
echo 'UUID="UUID HERE" /var xfs defaults 0 2' | sudo tee -a /etc/fstab
echo '/dev/sdb /var xfs defaults 0 2' | sudo tee -a /etc/fstab
sudo umount /mnt/tmp
sudo reboot
df -h /var/
df -Th /