今天发现虚拟机磁盘满了报警了，明明 50 GiB 可以用很久，怎么会这么快满了呢，找了各种数据库日志文件等半天始终找不出不对劲的文件。
最后一看，尼玛怎么只有 24 GiB
代码语言：javascript复制ubuntu@ubuntu:~$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 197M 852K 196M 1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv 24G 20G 2.5G 89% /
tmpfs 982M 16K 982M 1% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
/dev/sda2 2.0G 253M 1.6G 14% /boot
tmpfs 197M 4.0K 197M 1% /run/user/1000可是我明明分了 50 GiB 啊！？吓得我赶紧去后台看看
千真万确，不可能有问题，就是 50 GiB ，于是我用 fdisk 看了一下
代码语言：javascript复制ubuntu@ubuntu:~$ sudo fdisk -l
Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors
Disk model: QEMU HARDDISK
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 4ECC6C3D-8F13-4874-9686-81850F57E419
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 4198399 4194304 2G Linux filesystem
/dev/sda3 4198400 104855551 100657152 48G Linux filesystem
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 24 GiB, 25765609472 bytes, 50323456 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes还好，问题不大，50 GiB 读到了，也确实分给了 sda3 ，但是没有分给根分区
系统采用的是 LVM (Logical Volume Manager) 的方式管理磁盘，于是我又用 lsblk 看了一下
代码语言：javascript复制ubuntu@ubuntu:~$ sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 2G 0 part /boot
└─sda3 8:3 0 48G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 24G 0 lvm /
sr0 11:0 1 1.8G 0 rom 嗯，果然如此，Logical Volume 没有用尽 Volume Group 的空间
再看一下 Volume Group 的剩余空间
代码语言：javascript复制ubuntu@ubuntu:~$ sudo vgdisplay -A
--- 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 <48.00 GiB
PE Size 4.00 MiB
Total PE 12287
Alloc PE / Size 6143 / <24.00 GiB
Free PE / Size 6144 / 24.00 GiB
VG UUID NuezL3-DcLx-Rnxv-zCLD-Nq1N-GiJU-SFZrFY这好像看不看没区别，那就直接扩容吧
代码语言：javascript复制ubuntu@ubuntu:~$ sudo lvextend -l 100%FREE /dev/ubuntu-vg/ubuntu-lv
Size of logical volume ubuntu-vg/ubuntu-lv changed from <24.00 GiB (6143 extents) to <48.00 GiB (12287 extents).
Logical volume ubuntu-vg/ubuntu-lv successfully resized.
ubuntu@ubuntu:~$ sudo resize2fs /dev/ubuntu-vg/ubuntu-lv
resize2fs 1.46.5 (30-Dec-2021)
Filesystem at /dev/ubuntu-vg/ubuntu-lv is mounted on /; on-line resizing required
old_desc_blocks = 3, new_desc_blocks = 6
The filesystem on /dev/ubuntu-vg/ubuntu-lv is now 12581888 (4k) blocks long.扩容成功，现在再用 lsblk 看一下
代码语言：javascript复制ubuntu@ubuntu:~$ sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 2G 0 part /boot
└─sda3 8:3 0 48G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 48G 0 lvm /
sr0 11:0 1 1.8G 0 rom 这下没问题了
但是我发现 Volume Group 没有将所有的 Physical Volume 用完，或者没有关联到物理分区
根据我在 CSDN 看到的教程
以不损坏数据为前提，不对原分区 /dev/sda3 进行调整。而是将磁盘可用空间创建一个新的 /dev/sda4 分区，然后去关联 Volume Group，毕竟 Logical Volume Manager 非常灵活。
创建分区 sda4，将设置为 lvm 类型
（我已经加过了，就直接复制他的例子）
其实也可以用我在别的地方看到的方法：n , enter , enter , enter , w ，然后他会提示盘符创建成功（谨慎使用）
代码语言：javascript复制$ sudo fdisk /dev/sda
==> Command (m for help): p
Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 3A0A0460-1FC2-46FF-A278-3299E8F2B745
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 3719167 3715072 1.8G Linux filesystem
/dev/sda3 3719168 41940991 38221824 18.2G Linux filesystem
===> Command (m for help): n
Partition number (4-128, default 4):
First sector (41940992-104857566, default 41940992):
Last sector, /-sectors or /-size{K,M,G,T,P} (41940992-104857566, default 104857566):
Created a new partition 4 of type 'Linux filesystem' and of size 30 GiB.
===> Command (m for help): p
Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 3A0A0460-1FC2-46FF-A278-3299E8F2B745
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 3719167 3715072 1.8G Linux filesystem
/dev/sda3 3719168 41940991 38221824 18.2G Linux filesystem
/dev/sda4 41940992 104857566 62916575 30G Linux filesystem
===> Command (m for help): t
===> Partition number (1-4, default 4):
===> Partition type or alias (type L to list all): lvm
Changed type of partition 'Linux filesystem' to 'Linux LVM'.
===> Command (m for help): p
Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors
Disk model: VMware Virtual S
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 3A0A0460-1FC2-46FF-A278-3299E8F2B745
Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 3719167 3715072 1.8G Linux filesystem
/dev/sda3 3719168 41940991 38221824 18.2G Linux filesystem
/dev/sda4 41940992 104857566 62916575 30G Linux LVM
===> Command (m for help): w
The partition table has been altered.
Syncing disks.创建之后可以看到 我多出了一个 接近 1M 的 sda4 （ 就当他是 30GiB 嗯对 ）
ubuntu@ubuntu:~$ sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 2G 0 part /boot
├─sda3 8:3 0 48G 0 part
│ └─ubuntu--vg-ubuntu--lv 253:0 0 48G 0 lvm /
└─sda4 8:4 0 1007.5K 0 part
sr0 11:0 1 1.8G 0 rom将刚刚创建好的 sda4 创建成 Physical Volume
（这里依然用他的例子，因为我这里报错了，原因分区过小）
代码语言：javascript复制$ sudo pvcreate /dev/sda4
Physical volume "/dev/sda4" successfully created.
$ sudo pvdisplay
--- Physical volume ---
PV Name /dev/sda3
VG Name ubuntu-vg
PV Size <18.23 GiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 4665
Free PE 0
Allocated PE 4665
PV UUID vO0lgC-X0bG-nUat-kevg-FONv-OpNh-qwY5zF
"/dev/sda4" is a new physical volume of "30.00 GiB"
--- NEW Physical volume ---
PV Name /dev/sda4
VG Name
PV Size 30.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID A87gcC-J2mc-3jPD-4emh-8Ute-VQ52-Ceg7zu将 sda4 扩容到当前的 Volume Group
代码语言：javascript复制# 查看当前 VG
$ sudo vgdisplay
--- Volume group ---
VG Name ubuntu-vg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
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 18.22 GiB
PE Size 4.00 MiB
Total PE 4665
Alloc PE / Size 4665 / 18.22 GiB
Free PE / Size 0 / 0
VG UUID gHs11o-PLvl-3cw4-SIax-mcw6-7RCx-D4BEpo
# 将 PV 添加到 VG
$ sudo vgextend ubuntu-vg /dev/sda4
# 扩展成功
$ sudo vgdisplay
--- Volume group ---
VG Name ubuntu-vg
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size <48.22 GiB
PE Size 4.00 MiB
Total PE 12344
Alloc PE / Size 4665 / 18.22 GiB
Free PE / Size 7679 / <30.00 GiB
VG UUID gHs11o-PLvl-3cw4-SIax-mcw6-7RCx-D4BEpo接下来同一开始操作
代码语言：javascript复制$ sudo lvextend -l 100%FREE /dev/ubuntu-vg/ubuntu-lv
$ sudo resize2fs /dev/ubuntu-vg/ubuntu-lv
$ sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
fd0 2:0 1 4K 0 disk
loop0 7:0 0 79.9M 1 loop /snap/lxd/22923
loop1 7:1 0 62M 1 loop /snap/core20/1587
loop2 7:2 0 47M 1 loop /snap/snapd/16292
sda 8:0 0 50G 0 disk
├─sda1 8:1 0 1M 0 part
├─sda2 8:2 0 1.8G 0 part /boot
├─sda3 8:3 0 18.2G 0 part
│ └─ubuntu--vg-ubuntu--lv 253:0 0 48.2G 0 lvm /
└─sda4 8:4 0 30G 0 part
└─ubuntu--vg-ubuntu--lv 253:0 0 48.2G 0 lvm /参考文献
https://blog.csdn.net/dagjj/article/details/131259096
https://blog.51cto.com/u_15127659/4659100
https://blog.csdn.net/qq1090504117/article/details/131598038
