1 查看磁盘空间情况

2 备份后卸载/home分区

	umount /home/

3 删除/home所在的lv

	lvremove /dev/mapper/centos-home 
			#yes

4 扩容/dev/mapper/centos-root分区

	lvextend -L +100G /dev/mapper/centos-root

5 扩展/root文件系统

	xfs_growfs /dev/mapper/centos-root

6 重新创建home lv磁盘

	lvcreate -L 1G -n /dev/mapper/centos-home

7 创建文件系统，

	mkfs.xfs /dev/mapper/centos-home

8 挂载/home

	mount /dev/mapper/centos-home

9 查看