Hi Guixers,

thanks for Your advice Ludo and all other Guixers,

for Your information (first time of using gc):

After using Guix System for 6 month I did a:
"guix gc"

It collected about 50 GB and deleted that.
(I wanted to do that to get to know how it collects without deleting 
generations)
Than I deleted all generations
I did a "guix gc" again
and it deleted approx 40 GB again.

After that I did a
guix pull,
guix package -u,
sudo guix system reconfigure /etc/config.scm

and it downloaded approx 2,2 GB of packages.

The result of that is, that in future I will do a
"guix gc -F20G"
in order not to delete too much and later to redownload and rebuild them.

Gottfried



Am 09.08.22 um 22:18 schrieb Ludovic Courtès:
> Hi,
> 
> Felix Lechner via <help-guix@gnu.org> skribis:
> 
>> On Mon, Jul 25, 2022 at 2:52 AM Gottfried <gottfried@posteo.de> wrote:
>>>
>>> The manual says that it is dangerous to use: "guix gc"
>>> because it can delete too much.
>>
>> I agree that 'guix gc' deletes too much, but it's probably not
>> dangerous. You will just see some downloads and builds repeated when
>> reconfiguring later.
> 
> Indeed, it’s not dangerous, and I don’t think the manual suggests that.
> 
> To avoid collecting things just to redownload/rebuild them later, I
> usually ask ‘guix gc’ to free up some amount of space, as in:
> 
>    guix gc -F20G
> 
> That ensures 20G (more or less) are available on my disk and doesn’t try
> to collect more than that.
> 
> Thanks,
> Ludo’.