linux ext4缩容home，扩容根目录
- 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
