Can somebody give (or make) a guide how to increase the `dom0` qube space size?

balko · October 14, 2025, 7:40am

Can somebody give (or make) a guide how to increase the dom0 qube’s space size (resize, enlarge).
The original size is 20 GiB (set in installer).
How to make it 40 GiB, not losing any data?

The user may want it due to the possible problems with big templates or backing up process.

I understand that one need to increase size of:

qubes_dom0/root-pool
qubes_dom0/root
dom0 filesystem.

But it looks a bit scary doing blindly.

Any experience with that, guys?

MellowPoison · October 14, 2025, 9:32am

github.com/unman/notes

Installing_Templates_Qubes_4.1.md

master

# Installing Templates in Qubes 4.1

## Problem 
Qubes 4.1 has limited the size of dom0 to 20G by default.  
This means that when installing some templates, the install will fail with the message
`error an extra X required`.  
The problem is that when installing a template from an rpm package, the template is first unpacked in parts in `/var/lib/qubes/vm-templates/TEMPLATE_NAME`, and then rebuilt from those parts.

There are 2 solutions, depending on whether you want to permanently increase the size of dom0.

### 1. Resize dom0 permanently

```
sudo lvresize --size 40G /dev/qubes_dom0/root
sudo resize2fs /dev/mapper/qubes_dom0-root
```

### 2. Add more space to dom0 temporarily
The process here is to create a new thin_pool, and mount it in dom0 where the package will be unpacked.

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balko · October 14, 2025, 12:44pm

Thanks, good link. Unfortunately, it’s outdated. In R4.1 root LV was not inside root-pool as it is now in R4.2 (and R4.3, I think).

Maybe somebody did it on R4.2?

balko · October 19, 2025, 7:57am

OK, I did the guide for R4.2 myself: