Ubuntu 20.04扩容LVM分区

扩容(LVM)分区

1.查看磁盘情况
df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               1.9G     0  1.9G   0% /dev
tmpfs                              391M  1.6M  389M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   20G   17G  2.4G  88% /
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/sda2                          974M  135M  773M  15% /boot

2.显示存在的卷组
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               <29.00 GiB
  PE Size               4.00 MiB
  Total PE              7423
  Alloc PE / Size       5120 / 20.00 GiB
  Free  PE / Size       2303 / <9.00 GiB
  VG UUID               BEsGEW-TN2c-aOHh-e0Yk-wmWq-KXrR-C40Ule
可以看出Alloc PE / Size       5120 / 20.00 GiB
Free  PE / Size       2303 / <9.00 GiB 这两个
第一个就是我的 /dev/mapper/ubuntu–vg-ubuntu–lv 这个磁盘 
第二个是 这个磁盘可以扩容的大小 也就是剩余可以扩容多少

3.扩容开始
lvextend -l +100%FREE /dev/mapper/ubuntu--vg-ubuntu--lv
  Size of logical volume ubuntu-vg/ubuntu-lv changed from 20.00 GiB (5120 extents) to <29.00 GiB (7423 extents).
  Logical volume ubuntu-vg/ubuntu-lv successfully resized.

4.重新计算磁盘大小
resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv
#resize2fs /dev/ubuntu-vg/ubuntu-lv

5.重新查看磁盘情况
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               <29.00 GiB
  PE Size               4.00 MiB
  Total PE              7423
  Alloc PE / Size       7423 / <29.00 GiB
  Free  PE / Size       0 / 0
  VG UUID               BEsGEW-TN2c-aOHh-e0Yk-wmWq-KXrR-C40Ule

6.查看磁盘情况
df -h
Filesystem                         Size  Used Avail Use% Mounted on
udev                               1.9G     0  1.9G   0% /dev
tmpfs                              391M  1.6M  389M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv   29G   17G   11G  60% /
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/sda2                          974M  135M  773M  15% /boot