---
title: Increase the disksize of a VM (on Unraid)
summary: >
  Another quick'n'dirty note on how I finally enhanced the diskspace of
  my local mastodon test-instance placed as a virtual machine on my Unraid
  server.
  <small>The thumbnail was created with Google AI (Imagen 3).</small>
date: 2024-12-05T22:11:24+01:00
lastmod: 2024-12-08T12:05:22+0000
categories:
  - computerstuff
tags:
  - command-line
  - linux
  - server
  - unraid
---

Following these steps should suffice.

- First of all, shutdown the <abbr title="virtual machine">VM</abbr>
- Get some info about the image (I use a raw disk usually)

  ```console
  $ qemu-img info -f raw vdisk1.img
  ```

- Resize the image (add 40 gigabytes)

  ```console
  $ qemu-img resize -f raw vdisk1.img +40G
  ```

- Start the VM and log into a terminal on the VM
- Resize the filesystems partition up to 100%

  ```console
  $ sudo parted /dev/vda resizepart 2 100%
  ```

- Extend the filesystem on the resized partition (I use btrfs here)

  ```console
  $ sudo btrfs filesystem resize max /
  ```

  {{< alert "circle-info" >}}
  **Additional information for other filesystems**  
  For the classic ext4 filesystem it should be (not tested yet):

  ```console
  $ sudo resize2fs /dev/vda2
  ```

  {{< /alert >}}

- Reboot the VM

That's it. Following a few sources:

- https://gist.github.com/zakkak/ab08672ff9d137bbc0b2d0792a73b7d2
- https://linuxiac.com/how-to-resize-extend-kvm-virtual-disk-size/
- https://unix.stackexchange.com/questions/373063/auto-expand-last-partition-to-use-all-unallocated-space-using-parted-in-batch-m