fdisk -l
df -h
fdisk /dev/sda
pvcreate /dev/sda3
vgdisplay
vgextend centos /dev/sda3
lvextend -L +70G /dev/mapper/centos-root
resize2fs /dev/mapper/centos-root
xfs_growfs /dev/mapper/centos-root
原文：https://www.cnblogs.com/ruralcraftsman/p/15160461.html