This task is much easier than some might think. However, you have to resize the LVM and then the partition.

Most Linux distros, such as Ubuntu and Debian, prefer LVM. LVM is Logical Volume Manager that provides a method of allocating and managing space on mass-storage devices that is more advanced and flexible than the traditional method of partitioning storage volumes.

• Physical volumes: correspond to disks
• Volume groups: are collections of physical volumes
• Logical volumes: correspond to partitions

You can generally resize the partition when it is mounted, so there is no need to risk downtime.

1) First see if Linux shows the additional disk space "cfdisk".

If you do not see free space you will need to rescan the system.

2) Scan to make sure when you increase the disk size, the system has detected it

			
				echo 1 > /sys/class/block/sda/device/rescan			
		

3) Execute cfdisk

You will see you have free space. Go to the partition you wish to increase the disk size. Select resize, enter the amount of free space to use then write.

4) Write the new partion table

You must make sure select write and press enter. If you do not you will quit without making a change.

5) Extend the physical partition

			
				sudo pvdisplay
sudo pvresize /dev/sda3			
		

It should show a number bigger than 0 on Free PE.

6) Check the volume now shows the free space

			
				sudo vgdisplay			
		

7) Find the LV path you want to extend

			
				sudo lvdisplay			
		

8) Extend the LVM with the LV path previously found

			
				sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv			
		

9) Get the file system name

			
				df -h			
		

10) Resize the filesystem

In our case the main filesystem is /dev/mapper/ubuntu--vg-ubuntu--lv so we need to run the command

			
				resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv			
		

11) Check again with "df -h" for increase is filesystem size

			
				df -h