3. 缩容home（home盘为ext4文件格式）
   操作步骤的命令如下：
   查看盘符信息：df -Th
   卸载盘符：umount /dev/mapper/centos-home
   检查文件系统一致性：e2fsck -f /dev/mapper/centos-home
   调整文件系统大小：resize2fs /dev/mapper/centos-home 500M
   检查文件系统一致性：fsck /dev/mapper/centos-home
   减少逻辑卷大小：lvreduce -L 500M /dev/mapper/centos-home
   确定逻辑卷是否减少：resize2fs /dev/mapper/centos-home
   最后检查文件系统一致性：fsck /dev/mapper/centos-home
   挂载：mount /dev/mapper/centos-home /home
   查看卷组详情以及剩余空间：vgdisplay

针对ext4 /home缩容 /root扩容

缩容 /home
mkdir /root/home
cp /home/* /root/home
umount /dev/mapper/openeuler-home
resize2fs /dev/mapper/openeuler-home 40G
lvreduce -L 40G /dev/mapper/openeuler-home
mount /dev/mapper/openeuler-home /home
systemctl daemon-reload
cp  /root/home/* /home/

扩容 /

lvextend -L +280G /dev/mapper/openeuler-root
resize2fs  /dev/mapper/openeuler-root

操作之前

操作之后