查看分区信息命令：df -h

root@ubuntu:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              786M  1.4M  785M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   98G  8.5G   85G  10% /
tmpfs                              3.9G     0  3.9G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sda2                          2.0G  130M  1.7G   8% /boot
/dev/sda1                          1.1G  6.1M  1.1G   1% /boot/efi
tmpfs                              786M  4.0K  786M   1% /run/user/1000

查看LVM卷组的信息：vgdisplay
这里可以看到还有373.89G的剩余空间

root@ubuntu:~# vgdisplay
  --- Volume group ---
  VG Name               ubuntu-vg
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <473.89 GiB
  PE Size               4.00 MiB
  Total PE              121315
  Alloc PE / Size       25600 / 100.00 GiB
  Free  PE / Size       95715 / <373.89 GiB
  VG UUID               PNQNgd-OMuM-Io6B-Qlrp-tkuV-IvWp-qmUYOQ

调整空间命令

lvextend -L 10G /dev/mapper/ubuntu--vg-ubuntu--lv      //增大或减小至19G
lvextend -L +10G /dev/mapper/ubuntu--vg-ubuntu--lv     //增加10G
lvreduce -L -10G /dev/mapper/ubuntu--vg-ubuntu--lv     //减小10G
lvresize -l  +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv   //按百分比扩容
 
resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv            //重新调整逻辑卷大小

我们这里使用lvextend -L +350G /dev/mapper/ubuntu--vg-ubuntu--lv增加350G给lvm

lvextend -L +350G /dev/mapper/ubuntu--vg-ubuntu--lv

然后刷新一下分区resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv

resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv

最后df -h结果

root@ubuntu:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
tmpfs                              786M  1.4M  785M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv  443G  8.5G  415G   2% /
tmpfs                              3.9G     0  3.9G   0% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
/dev/sda2                          2.0G  130M  1.7G   8% /boot
/dev/sda1                          1.1G  6.1M  1.1G   1% /boot/efi
tmpfs                              786M  4.0K  786M   1% /run/user/1000

参考了网由的教程，教程如下：
https://blog.csdn.net/FLM19990626/article/details/131888427