linux根目录扩容

fdisk -l
df -h
lsblk
fdisk /dev/sdb
partprotbe
partprobe
vi /etc/fstab 
mount -a
df -h
mount /dev/sr0 /mnt
vi etc/fs
vi /etc/fstab 
mount -a
lsblk
pvdisplay
pvcreate /dev/sdb1 
pvdisplay
vgextend rhel /dev/sdb1
vgdisplay
lvdisplay
lvresize -L +7.99G /dev/mapper/root
lvresize -L +7.99G /root
lvresize -L +7.99G root
fdisk -l
lvresize -L +7.99G /dev/mapper/rhel-root
df -h
resize2fs /dev/mapper/rhel-root
xfs_growfs/dev/mapper/rhel-root
xfs_growfs /dev/mapper/rhel-root

参考：

https://www.cnblogs.com/lxyuuuuu/p/9717231.html