LVM是Linux系统中对磁盘分区进行管理的一种逻辑机制，它是建立在硬盘和分区之上、文件系统之下的一个逻辑层，在建立文件系统时屏蔽了下层的磁盘分区布局，能够在保持现有数据不变的情况下动态调整磁盘容量，从而提高磁盘管理的灵活性。
其实系统默认就有这个卷组：
[root@centos8 ~]# vgdisplay
--- Volume group ---
VG Name cl
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
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 79.80 GiB
PE Size 4.00 MiB
Total PE 20429
Alloc PE / Size 20429 / 79.80 GiB
Free PE / Size 0 / 0
VG UUID cAD3Mx-cHvj-jP05-dnHd-KpTj-z9Nd-VbFrbI
交换分区、根分区默认就使用了逻辑卷：
[root@centos8 ~]# lvdisplay
--- Logical volume ---
LV Path /dev/cl/swap
LV Name swap
VG Name cl
LV UUID obone0-20nl-Txhr-l6Vq-HadV-dCXD-RHpp3P
LV Write Access read/write
LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:40 +0800
LV Status available
# open 2
LV Size 4.00 GiB
Current LE 1024
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/cl/root
LV Name root
VG Name cl
LV UUID wuM8ey-9lxk-XAqv-U6hF-aQwY-oeOq-1ipcow
LV Write Access read/write
LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:41 +0800
LV Status available
# open 1
LV Size 75.80 GiB
Current LE 19405
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
查看根分区所使用的逻辑卷：
[root@centos8 ~]# lvdisplay /dev/cl/root
--- Logical volume ---
LV Path /dev/cl/root
LV Name root
VG Name cl
LV UUID wuM8ey-9lxk-XAqv-U6hF-aQwY-oeOq-1ipcow
LV Write Access read/write
LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:41 +0800
LV Status available
# open 1
LV Size 75.80 GiB
Current LE 19405
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
############
扩大根分区
虚拟机添加一块硬盘：
备注：服务器重启后，才能识别新硬盘。
查看第二块硬盘的分区情况：
fdisk -l /dev/nvme0n2
创建物理卷：
[root@centos8 ~]# pvcreate /dev/nvme0n2
Physical volume "/dev/nvme0n2" successfully created.
扩大卷组：
[root@centos8 ~]# vgextend cl /dev/nvme0n2
Volume group "cl" successfully extended
卷组扩大成功了
[root@centos8 ~]# vgdisplay
--- Volume group ---
VG Name cl
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size <109.80 GiB
PE Size 4.00 MiB
Total PE 28108
Alloc PE / Size 20429 / 79.80 GiB
Free PE / Size 7679 / <30.00 GiB
VG UUID cAD3Mx-cHvj-jP05-dnHd-KpTj-z9Nd-VbFrbI
扩展逻辑卷（不能把空间全部分完，要留0.1G！）
[root@centos8 ~]# lvextend -L +29.9G /dev/cl/root
Rounding size to boundary between physical extents: 29.90 GiB.
Size of logical volume cl/root changed from 75.80 GiB (19405 extents) to 105.70 GiB (27060 extents).
Logical volume cl/root successfully resized.
逻辑卷扩展成功：
[root@centos8 ~]# lvdisplay /dev/cl/root
--- Logical volume ---
LV Path /dev/cl/root
LV Name root
VG Name cl
LV UUID wuM8ey-9lxk-XAqv-U6hF-aQwY-oeOq-1ipcow
LV Write Access read/write
LV Creation host, time centos8.zhuohua.store, 2020-01-29 13:10:41 +0800
LV Status available
# open 1
LV Size 105.70 GiB
Current LE 27060
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
刷新xfs文件系统：
[root@centos8 ~]# xfs_growfs /
注释：逻辑卷/dev/cl/root挂载在根分区。
根分区扩展成功：
备注：根分区扩展无需重启系统；重启系统后，系统也正常。
相关文章：
CentOS6_LVM_扩大根分区
CentOS7.8扩大/var分区
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