1、备份home分区cp -r /home/ homebak不挂载在/home下umount /home/过程中出现下面情况参考如图所示显示设备忙碌利用fuser查看进程并kill掉fuser -m /home查看相关进程参数，kill -9 1875杀死进程并检查结果备份home分区cp -r /home/ homebak不挂载在/homeumount /home/
2、删除home所在的LVM逻辑卷lvremove /dev/mapper/centos-home
3、增加root所在的逻辑卷lvextend -L +40G /dev/mapper/centos-root
4、同步root文件系统 xfs_growfs /dev/mapper/centos-root
5、重新创建home的LVM逻辑卷vgdisplay查看剩余空间大小
6、增加至home下lvcreate -L 6.5G -n home centos
7、创建home文件系统mkfs.xfs /dev/centos/home
8、挂载到home下mount /dev/centos/home /home将之前home的备份文件copy到新的home下cp -r /root/homebak/* /home
