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Resize Ubuntu VM Disk in Proxmox VE

This guide details the steps to successfully resize the disk space allocated to your Ubuntu VM within the Proxmox VE environment.

Prerequisites:

  • Proxmox VE server with an Ubuntu VM
  • Basic understanding of Linux commands (optional, but helpful)

Steps:

  1. Increase Disk Size in Proxmox VE Web Interface:

    • Shut down your Ubuntu VM.
    • Navigate to the Proxmox VE web interface and select your VM.
    • Go to the "Hardware" tab.
    • Click on the virtual disk you want to resize.
    • Under "Disk Actions," choose "Resize."
    • Enter the desired new disk size and click "Resize" to confirm.

  2. Extend Physical Drive Partition (if LVM is not used):

    Caution: These steps involve modifying partitions. Proceed with caution and ensure you have a backup of your VM data in case of any issues.

    • Log in to your Proxmox VE host via SSH.

    • Verify the current disk layout using:

      sudo fdisk -l

    • Identify the partition you want to extend (usually the third partition, /dev/sda3).

    • Use growpart to extend the partition size:

      sudo growpart /dev/sda 3

      Follow the on-screen prompts to specify the desired new size.

  3. Extend Logical Volume (if LVM is used):

    • If your Ubuntu VM uses Logical Volume Management (LVM), follow these steps:

      • Check the current Logical Volume information:

        lvdisplay

      • View the physical drive information using pvdisplay:

        sudo pvdisplay

      • Identify the physical volume name associated with your extended partition (e.g., /dev/sda3).

      • Instruct LVM that the disk size has changed:

        sudo pvresize /dev/sda3

      • Verify the updated physical drive information:

        sudo pvdisplay

      • Extend the Logical Volume using its name (e.g., /dev/ubuntu-vg/ubuntu-lv):

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

        The -l +100%FREE option utilizes all available free space within the Volume Group.

  4. Resize Filesystem:

    • Resize the filesystem on the extended partition to utilize the additional space:

      resize2fs /dev/ubuntu-vg/ubuntu-lv

  5. Verify Changes:

    • Confirm that the disk and filesystem have been resized successfully:

      fdisk -l

    • You can also boot your Ubuntu VM and use tools like df -h to check the available disk space.

Additional Notes:

  • Consider backing up your VM before proceeding with these steps.
  • If you encounter issues, consult the Proxmox VE documentation or seek help from the Proxmox community forums.