參考地址：https://blog.csdn.net/Fly_1213/article/details/105142427
使用vmbox安裝了ubuntu server的虛擬機，分配了50G的磁盤空間，但是使用df命令查看，發現總的磁盤空間不足50G
root@ubuntu1:/home/lyh# df -h Filesystem Size Used Avail Use% Mounted on udev 1.9G 0 1.9G 0% /dev tmpfs 394M 1.1M 393M 1% /run /dev/mapper/ubuntu--vg-ubuntu--lv 24G 13G 11G 55% / tmpfs 2.0G 0 2.0G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup /dev/loop1 56M 56M 0 100% /snap/core18/2253 /dev/loop0 56M 56M 0 100% /snap/core18/2246 /dev/loop4 68M 68M 0 100% /snap/lxd/21545 /dev/loop3 62M 62M 0 100% /snap/core20/1242 /dev/loop5 68M 68M 0 100% /snap/lxd/21835 /dev/loop6 33M 33M 0 100% /snap/snapd/13640 /dev/loop7 43M 43M 0 100% /snap/snapd/14066 /dev/sda2 976M 203M 707M 23% /boot tmpfs 394M 0 394M 0% /run/user/1000 /dev/loop8 62M 62M 0 100% /snap/core20/1270
發現 /dev/mapper/ubuntu--vg-ubuntu--lv 只有24個G的空間
查看所有塊設備，以及他們之間的依賴關系
root@ubuntu1:/home/lyh# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT loop0 7:0 0 55.5M 1 loop /snap/core18/2246 loop1 7:1 0 55.5M 1 loop /snap/core18/2253 loop3 7:3 0 61.9M 1 loop /snap/core20/1242 loop4 7:4 0 67.3M 1 loop /snap/lxd/21545 loop5 7:5 0 67.2M 1 loop /snap/lxd/21835 loop6 7:6 0 32.5M 1 loop /snap/snapd/13640 loop7 7:7 0 42.2M 1 loop /snap/snapd/14066 loop8 7:8 0 61.9M 1 loop /snap/core20/1270 sda 8:0 0 50G 0 disk ├─sda1 8:1 0 1M 0 part ├─sda2 8:2 0 1G 0 part /boot └─sda3 8:3 0 49G 0 part └─ubuntu--vg-ubuntu--lv 253:0 0 24.5G 0 lvm / sr0 11:0 1 1024M 0 rom
發現sda3實際有50個G的空間，但是 ubuntu--vg-ubuntu--lv 只有24.5個G，剩余的空間並沒有顯示
查看LVM卷組的信息
root@ubuntu1:/home/lyh# 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 <49.00 GiB PE Size 4.00 MiB Total PE 12543 Alloc PE / Size 6272 / 24.50 GiB Free PE / Size 6271 / <24.50 GiB VG UUID QV4pAN-R1BR-42Ln-Vv4J-58Nb-uniH-0qizNA
發現還有24.5G的 Free空間未分配
lvextend -L 20G /dev/mapper/ubuntu--vg-ubuntu--lv //增大或減小至20G lvextend -L +10G /dev/mapper/ubuntu--vg-ubuntu--lv //增加10G lvreduce -L -10G /dev/mapper/ubuntu--vg-ubuntu--lv //減小10G lvresize -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv //按百分比擴容 resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv //執行調整
例如：在我原有的磁盤上增加10個G
root@ubuntu1:/home/lyh# lvextend -L +10G /dev/mapper/ubuntu--vg-ubuntu--lv Size of logical volume ubuntu-vg/ubuntu-lv changed from 24.50 GiB (6272 extents) to 34.50 GiB (8832 extents). Logical volume ubuntu-vg/ubuntu-lv successfully resized. root@ubuntu1:/home/lyh# resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv resize2fs 1.45.5 (07-Jan-2020) Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required old_desc_blocks = 4, new_desc_blocks = 5 The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 9043968 (4k) blocks long. root@ubuntu1:/home/lyh# df -h Filesystem Size Used Avail Use% Mounted on udev 1.9G 0 1.9G 0% /dev tmpfs 394M 1.1M 393M 1% /run /dev/mapper/ubuntu--vg-ubuntu--lv 34G 13G 20G 39% / tmpfs 2.0G 0 2.0G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup /dev/loop1 56M 56M 0 100% /snap/core18/2253 /dev/loop0 56M 56M 0 100% /snap/core18/2246 /dev/loop4 68M 68M 0 100% /snap/lxd/21545 /dev/loop3 62M 62M 0 100% /snap/core20/1242 /dev/loop5 68M 68M 0 100% /snap/lxd/21835 /dev/loop6 33M 33M 0 100% /snap/snapd/13640 /dev/loop7 43M 43M 0 100% /snap/snapd/14066 /dev/sda2 976M 203M 707M 23% /boot tmpfs 394M 0 394M 0% /run/user/1000 /dev/loop8 62M 62M 0 100% /snap/core20/1270
可以看到，/dev/mapper/ubuntu--vg-ubuntu--lv 已經增加了10個G