For this method, you will need to attach a new disk to your Deskpro server in your hypervisor, then restart your VM in order for the kernel to recognise the new disk has been added.

Identifying the additional disk

Once the VM has restarted, run the command fdisk -l, and you should see your original disk, your Logical Volume, and your new disk.

Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors
Disk model: Virtual disk    
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: 0F162CEE-5CE2-4CFB-8187-C1770A85FA78

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 104857566 100659167  48G Linux filesystem


Disk /dev/sdb: 50 GiB, 53687091200 bytes, 104857600 sectors
Disk model: Virtual disk    
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 48 GiB, 51535413248 bytes, 100655104 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
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In the example above, the original disk is /dev/sda, the new disk is /dev/sdb and the logical volume is /dev/mapper/ubuntu--vg-ubuntu--lv. You can easily identify the new disk added as it will have a 'Disk model', but no partitions mapped.

Creating a Physical Volume

As we are adding the entire disk to the volume group, we can create a physical volume on this new disk without partitioning.

To do so, simply run the command pvcreate </path/to/disk>:

root@deskpro:~# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.
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If you now run the command pvdisplay, you should see that your disk added to the list marked as a 'new physical volume':

root@deskpro:~# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               ubuntu-vg
  PV Size               <48.00 GiB / not usable 16.50 KiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              12287
  Free PE               0
  Allocated PE          12287
  PV UUID               nCxUhI-F1e4-BYBy-oMzz-QOaV-ksfK-VRcz1f
   
  "/dev/sdb" is a new physical volume of "50.00 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sdb
  VG Name               
  PV Size               50.00 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               p2zEOF-yyMd-1nni-09yQ-4WqP-eC66-NhHDh7
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Adding to the Volume Group

Now the Physical Volume has been created we need to add it to the Volume Group so it can be allocated.

First, run vgdisplay and make a note of the VG Name. You should also see that the 'Free PE / Size' is currently 0 / 0:

root@deskpro:~# vgdisplay
  --- Volume group ---
  VG Name               ubuntu-vg
  System ID             
  Format                lvm2
  Metadata Areas        1
  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                1
  Act PV                1
  VG Size               <48.00 GiB
  PE Size               4.00 MiB
  Total PE              12287
  Alloc PE / Size       12287 / <48.00 GiB
  Free  PE / Size       0 / 0   
  VG UUID               YuHCnH-4xGx-jk7p-52mH-epkG-Qbvn-OVjYBw
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To extend the volume group, run the command vgextend <VG Name> <PV Name>:

root@deskpro:~# vgextend ubuntu-vg /dev/sdb
  Volume group "ubuntu-vg" successfully extended
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Now, check both pvdisplay and vgdisplay. You should see that the new physical volume has been added to your virtual group and is allocatable, and the volume group now has additional space in Free PE / Size:

root@deskpro:~# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda3
  VG Name               ubuntu-vg
  PV Size               <48.00 GiB / not usable 16.50 KiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              12287
  Free PE               0
  Allocated PE          12287
  PV UUID               nCxUhI-F1e4-BYBy-oMzz-QOaV-ksfK-VRcz1f
   
  --- Physical volume ---
  PV Name               /dev/sdb
  VG Name               ubuntu-vg
  PV Size               50.00 GiB / not usable 4.00 MiB
  Allocatable           yes 
  PE Size               4.00 MiB
  Total PE              12799
  Free PE               12799
  Allocated PE          0
  PV UUID               p2zEOF-yyMd-1nni-09yQ-4WqP-eC66-NhHDh7
   
root@deskpro:~# vgdisplay
  --- Volume group ---
  VG Name               ubuntu-vg
  System ID             
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  5
  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               97.99 GiB
  PE Size               4.00 MiB
  Total PE              25086
  Alloc PE / Size       12287 / <48.00 GiB
  Free  PE / Size       12799 / <50.00 GiB
  VG UUID               YuHCnH-4xGx-jk7p-52mH-epkG-Qbvn-OVjYBw
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With the space now being available to the volume group, move on to Growing the Logical Volume