centos7 将home目录空间扩容到根目录

[root@localhost ~]# umount /home/
[root@localhost ~]# lvremove /dev/mapper/centos-home
Do you really want to remove active logical volume centos/home? [y/n]: y
  Logical volume "home" successfully removed
[root@localhost ~]# lvextend -L +120G  /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB ( extents) to 170.00 GiB ( extents).
  Logical volume centos/root successfully resized.
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=    agcount=, agsize= blks
         =                       sectsz=   attr=, projid32bit=
         =                       crc=        finobt= spinodes=
data     =                       bsize=   blocks=, imaxpct=
         =                       sunit=      swidth= blks
naming   =version               bsize=   ascii-ci= ftype=
log      =internal               bsize=   blocks=, version=
         =                       sectsz=   sunit= blks, lazy-count=
realtime =none                   extsz=   blocks=, rtextents=
data blocks changed from  to
[root@localhost ~]# lvcreate -L 47G -n home centos
  Logical volume "home" created.
[root@localhost ~]# mkfs.xfs  /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=    agcount=, agsize= blks
         =                       sectsz=   attr=, projid32bit=
         =                       crc=        finobt=, sparse=
data     =                       bsize=   blocks=, imaxpct=
         =                       sunit=      swidth= blks
naming   =version               bsize=   ascii-ci= ftype=
log      =internal log           bsize=   blocks=, version=
         =                       sectsz=   sunit= blks, lazy-count=
realtime =none                   extsz=   blocks=, rtextents=
[root@localhost ~]# mount  /dev/mapper/centos-home  /home
[root@localhost ~]# df -h
文件系统                 容量  已用  可用 已用% 挂载点
/dev/mapper/centos-root  170G  899M  170G    % /
devtmpfs                  63G        63G    % /dev
tmpfs                     63G        63G    % /dev/shm
tmpfs                     63G  9.5M   63G    % /run
tmpfs                     63G        63G    % /sys/fs/cgroup
/dev/sda2               1014M  135M  880M   % /boot
/dev/sda1                200M  9.8M  191M    % /boot/efi
tmpfs                     13G        13G    % /run/user/
/dev/mapper/centos-home   47G   33M   47G    % /home
[root@localhost ~]# lsblk
NAME            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda               :       223G   disk
├─sda1            :       200M   part /boot/efi
├─sda2            :         1G   part /boot
└─sda3            :     .8G   part
  ├─centos-root :       170G   lvm  /
  ├─centos-swap :         4G   lvm  [SWAP]
  └─centos-home :        47G   lvm  /home
sdb               :      .9T   disk
sdc               :      .9T   disk