ubuntu20.04 server 安装后磁盘空间只有一半的处理

root@xserver:~# 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               <930.01 GiB
  PE Size               4.00 MiB
  Total PE              238082
  Alloc PE / Size       51200 / 200.00 GiB
  Free  PE / Size       186882 / <730.01 GiB
  VG UUID               y2MIFl-1LSQ-LdlQ-OE3W-U7E3-f0zB-Hrlq45

可以看到还有Free PE/Size 186882/<730.01 GiB，下面就要把这部分空间利用起来
看磁盘目录

root@tboyserver:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                                32G     0   32G   0% /dev
tmpfs                              6.3G  1.6M  6.3G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv  196G   12G  175G   6% /
tmpfs                               32G  4.0K   32G   1% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
tmpfs                               32G     0   32G   0% /sys/fs/cgroup
/dev/nvme0n1p2                     976M  107M  802M  12% /boot
/dev/nvme0n1p1                     511M  5.3M  506M   2% /boot/efi
/dev/loop0                          56M   56M     0 100% /snap/core18/2246
/dev/loop1                          56M   56M     0 100% /snap/core18/2253
/dev/loop3                          33M   33M     0 100% /snap/snapd/12704
/dev/loop4                          68M   68M     0 100% /snap/lxd/21835
/dev/loop2                          71M   71M     0 100% /snap/lxd/21029
/dev/loop5                          33M   33M     0 100% /snap/snapd/13640
/dev/loop6                          62M   62M     0 100% /snap/core20/1242
tmpfs                              6.3G     0  6.3G   0% /run/user/1000

扩展磁盘空间

root@xserver:~# lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
  Size of logical volume ubuntu-vg/ubuntu-lv changed from 200.00 GiB (51200 extents) to <930.01 GiB (238082 extents).
  Logical volume ubuntu-vg/ubuntu-lv successfully resized.

重新计算磁盘大小

root@xserver:~# 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 = 25, new_desc_blocks = 117
The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 243795968 (4k) blocks long.

再次查看磁盘情况：

root@xserver:~# df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                                32G     0   32G   0% /dev
tmpfs                              6.3G  1.6M  6.3G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv  915G   12G  865G   2% /
tmpfs                               32G  4.0K   32G   1% /dev/shm
tmpfs                              5.0M     0  5.0M   0% /run/lock
tmpfs                               32G     0   32G   0% /sys/fs/cgroup
/dev/nvme0n1p2                     976M  107M  802M  12% /boot
/dev/nvme0n1p1                     511M  5.3M  506M   2% /boot/efi
/dev/loop0                          56M   56M     0 100% /snap/core18/2246
/dev/loop1                          56M   56M     0 100% /snap/core18/2253
/dev/loop3                          33M   33M     0 100% /snap/snapd/12704
/dev/loop4                          68M   68M     0 100% /snap/lxd/21835
/dev/loop2                          71M   71M     0 100% /snap/lxd/21029
/dev/loop5                          33M   33M     0 100% /snap/snapd/13640
/dev/loop6                          62M   62M     0 100% /snap/core20/1242
tmpfs                              6.3G     0  6.3G   0% /run/user/1000
root@xserver:~# 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               <930.01 GiB
  PE Size               4.00 MiB
  Total PE              238082
  Alloc PE / Size       238082 / <930.01 GiB
  Free  PE / Size       0 / 0   
  VG UUID               y2MIFl-1LSQ-LdlQ-OE3W-U7E3-f0zB-Hrlq45