Disk Resizing on Ubuntu VM with LVM

0. Resize the disk from the hypervisor (e.g.: Proxmox)

1. Rescan the Disk & Check the current partitions

Before starting, ensure the kernel recognizes the new size of the disk:

sudo partprobe
Warning: Not all of the space available to /dev/sda appears to be used, you can fix the GPT to use all of the space (an extra 209715200 blocks) or continue with the current setting? 

If you get a warning about unused space in the GPT, you can fix it using the steps in the next section.

Now, let's list the current partition:

lsblk

2. Resize the Partition

Use parted to resize the partition

1. Open parted:

   sudo parted /dev/sda

2. Inside parted, print the current partition layout:

   print

3. Resize the last partition (sda3) to use all available space:

   resizepart 3 100%

4. Exit parted:

   quit

3. Resize the Physical Volume (PV)

Once the partition is resized, expand the Physical Volume (PV):

sudo pvresize /dev/sda3

4. Extend the Logical Volume (LV)

Extend the Logical Volume (LV) to use the newly available space:

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

5. Resize the Filesystem

Resize the filesystem to utilize the expanded logical volume.

For ext4 filesystem:

sudo resize2fs /dev/ubuntu-vg/ubuntu-lv

For XFS filesystem:

sudo xfs_growfs /dev/ubuntu-vg/ubuntu-lv

6. Verify the Changes

Check the new disk size using:

df -h

This should show the updated disk space on your root partition.