命令总汇

# mkdir /backup  
# mv /home/* /backup/  
# umount /home  
# lvremove /dev/centos/home  
# lvcreate -L 50G -n home cents  
# mkfs -t xfs /dev/centos/home  
# mv /backup/* /home/  
# lvextend -L +xxxG /dev/centos/root  
# xfs_growfs root  
# rm -rf /backup

df -h //查看磁盘使用情况，逻辑卷的挂载格式为/dev/mapper/VolumeGroupName-LogicalVolumeName
# cat /etc/fstab
# vgdisplay //查看逻辑卷组情况
# lvdisplay //查看逻辑卷情况，默认三个，root、home和交换空间swap