xfs 分区回收空间之后划給其它挂载点使用

操作步骤

rpm -ivh attr-2.4.46-13.el7.x86_64.rpm xfsdump-3.1.7-1.el7.x86_64.rpm 
xfsdump -f /tmp/home.dump /home
sudo umount /home
lvreduce -L -200G /dev/centos/home
mkfs.xfs -f /dev/centos/home
mount /dev/mapper/centos-home /home/
xfsrestore -f /tmp/home.dump /home
lvcreate -L 150G -n opt centos
mkfs.xfs /dev/centos/opt
echo "/dev/mapper/centos-opt /opt                   xfs     defaults        0 0" >>/etc/fstab 
mount /dev/mapper/centos-opt /opt/