How to setup PBS on single disk VPS?

Hi,

I need to setup PBS on a single disk VPS. I installed PBS using the official ISO on a 100GB VPS and during the setup I defined PBS partition to be 20GB, so I have 80GB unused space.

Can anyone please give me the step-by-step SSH commands I need to use in order to make the 80GB unused space as a backup space?

I have tried multiple ways, but none as worked. PBS keeps showing "No disks unused".

Here is how my disks show after PBD installation. As you can see disk /dev/sda as 100 GiB...

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