1、删除开机默认挂载/dev/mapper/centos-home
vi /etc/fstab 把/dev/mapper/centos-home这一行删除
2、命令取消挂载/dev/mapper/centos-home
umount /dev/mapper/centos-home
3、删除掉逻辑卷 home
lvremove /dev/mapper/centos-home
4、查看VG卷组,并把剩余容量分给逻辑卷root
查看vgs
添加到/root卷组中
lvextend -l +100%FREE /dev/mapper/centos-root
5、最后需要执行下命令,让系统知道磁盘容量已发生变化
xfs_growfs /dev/centos/root