1：解除挂载
umount /home
如报错：
[root@zabbix-hk-01 home]# umount /home
umount: /home：目标忙。
(有些情况下通过 lsof(8) 或 fuser(1) 可以
找到有关使用该设备的进程的有用信息)
查找占用进程
[root@zabbix-hk-01 home]# fuser -mv /home
用户 进程号 权限 命令
/home: root kernel mount /home
root 104289 ..c.. bash
[root@zabbix-hk-01 home]# kill -9 104289
再次运行：
umount /home
2：删除逻辑卷home
lvremove /dev/centos/home
[root@zabbix-hk-01 /]# lvremove /dev/centos/home
Do you really want to remove active logical volume centos/home? [y/n]: y
Logical volume "home" successfully removed
3：查看卷组可用空间 vgdisplay
[root@zabbix-hk-01 /]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <299.00 GiB
PE Size 4.00 MiB
Total PE 76543
Alloc PE / Size 13792 / <53.88 GiB
Free PE / Size 62751 / 245.12 GiB
VG UUID tAIuiq-fX7C-BiHa-yb0j-QzVp-T6A0-lpUNsn
4：新建卷 lvcreate -L 50G -n home centos
[root@zabbix-hk-01 /]# lvcreate -L 50G -n home centos
WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/centos/home.
Logical volume "home" created.
5：查看逻辑卷空间 lvdisplay
[root@zabbix-hk-01 /]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID eowOwC-QBD1-F30j-P4qx-YGdP-eKWb-KRtWuP
LV Write Access read/write
LV Creation host, time localhost, 2019-01-10 17:25:37 +0800
LV Status available
# open 2
LV Size <3.88 GiB
Current LE 992
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1 --- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID QOG2IY-DbGU-ces4-7I91-1gQ7-fszz-BocFkV
LV Write Access read/write
LV Creation host, time localhost, 2019-01-10 17:25:37 +0800
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0 --- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID 4hlXcF-Jrk3-wSPL-A7Dt-87EI-XarC-05Hve1
LV Write Access read/write
LV Creation host, time zabbix-hk-01, 2019-01-30 08:40:20 +0800
LV Status available
# open 0
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
6：查看卷空间 vgdisplay
[root@zabbix-hk-01 /]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size <299.00 GiB
PE Size 4.00 MiB
Total PE 76543
Alloc PE / Size 26592 / <103.88 GiB
Free PE / Size 49951 / 195.12 GiB
VG UUID tAIuiq-fX7C-BiHa-yb0j-QzVp-T6A0-lpUNsn
7：激活卷组（可选）
[root@zabbix-hk-01 /]# vgchange -ay centos
3 logical volume(s) in volume group "centos" now active
8：在新逻辑卷/home上建立xfs文件系统
[root@zabbix-hk-01 /]# mkfs -t xfs /dev/centos/home
meta-data=/dev/centos/home isize=512 agcount=4, agsize=3276800 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0, sparse=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 log bsize=4096 blocks=6400, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
9：把新建的逻辑卷挂载到/home,并查验df -h
[root@zabbix-hk-01 /]# mount /dev/centos/home /home/
[root@zabbix-hk-01 /]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 50G 4.1G 46G 9% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 362M 3.5G 10% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/xvda1 1014M 185M 830M 19% /boot
tmpfs 780M 0 780M 0% /run/user/0
/dev/mapper/centos-home 50G 33M 50G 1% /home
10：查看空闲空间
[root@zabbix-hk-01 /]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size <299.00 GiB
PE Size 4.00 MiB
Total PE 76543
Alloc PE / Size 26592 / <103.88 GiB
Free PE / Size 49951 / 195.12 GiB
VG UUID tAIuiq-fX7C-BiHa-yb0j-QzVp-T6A0-lpUNsn
11：分配空间
[root@zabbix-hk-01 /]# lvextend -L +195.12G /dev/centos/root
Rounding size to boundary between physical extents: 195.12 GiB.
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 245.12 GiB (62751 extents).
Logical volume centos/root successfully resized.
12：查看卷组情况 root 空间已扩展
[root@zabbix-hk-01 /]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID eowOwC-QBD1-F30j-P4qx-YGdP-eKWb-KRtWuP
LV Write Access read/write
LV Creation host, time localhost, 2019-01-10 17:25:37 +0800
LV Status available
# open 2
LV Size <3.88 GiB
Current LE 992
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1 --- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID QOG2IY-DbGU-ces4-7I91-1gQ7-fszz-BocFkV
LV Write Access read/write
LV Creation host, time localhost, 2019-01-10 17:25:37 +0800
LV Status available
# open 1
LV Size 245.12 GiB
Current LE 62751
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0 --- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID 4hlXcF-Jrk3-wSPL-A7Dt-87EI-XarC-05Hve1
LV Write Access read/write
LV Creation host, time zabbix-hk-01, 2019-01-30 08:40:20 +0800
LV Status available
# open 1
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:2
13：查看磁盘分配情况 （不使用xfs_growfs扩展文件系统，磁盘不会识别分配空间）
[root@zabbix-hk-01 conf]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 50G 4.1G 46G 9% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 362M 3.5G 10% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/xvda1 1014M 185M 830M 19% /boot
tmpfs 780M 0 780M 0% /run/user/0
/dev/mapper/centos-home 50G 33M 50G 1% /home
14：xfs_growfs /dev/centos/root
[root@zabbix-hk-01 /]# xfs_growfs /dev/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 64257024
15：df -h
[root@zabbix-hk-01 /]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/centos-root 246G 4.1G 242G 2% /
devtmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 362M 3.5G 10% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/xvda1 1014M 185M 830M 19% /boot
tmpfs 780M 0 780M 0% /run/user/0
/dev/mapper/centos-home 50G 33M 50G 1% /home
感谢：
https://blog.****.net/evandeng2009/article/details/49814097/