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.csdn.net/evandeng2009/article/details/49814097/