How to expand disks from the command line in Ubuntu.

This is something I do fairly frequently, and I can never remember the steps. So I decided to write them down.

1. Rescan for disk size changes

echo 1 | sudo tee /sys/class/block/sda/device/rescan

2. Extend the physical partition (if needed)

sudo growpart /dev/sda 3

3. Resize the physical volume

sudo pvresize /dev/sda3

4. Extend the logical volume to use all available space

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

5. Resize the filesystem

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

6. Verify the new size

df -h