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 (12800 extents) to 170.00 GiB (43520 extents).
Logical volume centos/root successfully resized.
[root@localhost ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=13107200, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 13107200 to 44564480
[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=512 agcount=4, agsize=3080192 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=0
data = bsize=4096 blocks=12320768, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal log bsize=4096 blocks=6016, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
[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 1% /
devtmpfs 63G 0 63G 0% /dev
tmpfs 63G 0 63G 0% /dev/shm
tmpfs 63G 9.5M 63G 1% /run
tmpfs 63G 0 63G 0% /sys/fs/cgroup
/dev/sda2 1014M 135M 880M 14% /boot
/dev/sda1 200M 9.8M 191M 5% /boot/efi
tmpfs 13G 0 13G 0% /run/user/0
/dev/mapper/centos-home 47G 33M 47G 1% /home
[root@localhost ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 223G 0 disk
├─sda1 8:1 0 200M 0 part /boot/efi
├─sda2 8:2 0 1G 0 part /boot
└─sda3 8:3 0 221.8G 0 part
├─centos-root 253:0 0 170G 0 lvm /
├─centos-swap 253:1 0 4G 0 lvm [SWAP]
└─centos-home 253:2 0 47G 0 lvm /home
sdb 8:16 0 8.9T 0 disk
sdc 8:32 0 8.9T 0 disk