lvm空间扩容

 1[root@localhost ~]# df -H
 2Filesystem               Size  Used Avail Use% Mounted on
 3devtmpfs                  17G     0   17G   0% /dev
 4tmpfs                     17G     0   17G   0% /dev/shm
 5tmpfs                     17G  9.1M   17G   1% /run
 6tmpfs                     17G     0   17G   0% /sys/fs/cgroup
 7/dev/mapper/centos-root   54G  1.4G   53G   3% /
 8/dev/sda2                1.1G  148M  916M  14% /boot
 9/dev/sda1                210M   12M  198M   6% /boot/efi
10/dev/mapper/centos-home   12T   35M   12T   1% /home
11tmpfs                    3.4G     0  3.4G   0% /run/user/0

 1umount /home
 2
 3lvreduce -L 5T /dev/mapper/centos-home
 4
 5lvextend -L +5T /dev/mapper/centos-root
 6
 7xfs_growfs /dev/mapper/centos-root
 8
 9mkfs.xfs -f /dev/mapper/centos-home
10
11mount /home