"guix gc" needs free disk space to function

OpenSubmitted by Nathan Dehnel.
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3 participants
  • Ludovic Courtès
  • Nathan Dehnel
  • Vincent Legoll
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Nathan Dehnel wrote on 16 Dec 2020 07:36
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(name . Tobias Geerinckx-Rice via Bug reports for GNU Guix)(address . bug-guix@gnu.org)
CAEEhgEs98HiGKE2QPee09M0VnpvgnqD840V_wkV8bukrLw_+WA@mail.gmail.com
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It would be better if guix gc could run on a disk that was completely
full, as right now it cannot be used to free space on a full disk.
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Ludovic Courtès wrote on 22 Dec 2020 15:37
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(name . Nathan Dehnel)(address . ncdehnel@gmail.com)(address . 45266@debbugs.gnu.org)
875z4t29g6.fsf@gnu.org
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Hi,

Nathan Dehnel <ncdehnel@gmail.com> skribis:

Toggle quote (3 lines)
> It would be better if guix gc could run on a disk that was completely
> full, as right now it cannot be used to free space on a full disk.

The daemon reserves a bit of extra space before starting operation (see
‘reserve-space?’ in (guix store)), which should be enough to gracefully
handle situations where builds are filling the disk.

However, there can also be non-Guix processes filling the disk, to the
point where it’s completely full, and at that point sqlite3 (which the
daemon uses) may be unable to operate.

I’m afraid there’s little we can do in this case.

Thoughts?

Ludo’.
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Nathan Dehnel wrote on 22 Dec 2020 19:05
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(name . Ludovic Courtès)(address . ludo@gnu.org)(address . 45266@debbugs.gnu.org)
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Toggle quote (1 lines)
>The daemon reserves a bit of extra space before starting operation (see
‘reserve-space?’ in (guix store)), which should be enough to gracefully
handle situations where builds are filling the disk.

Toggle quote (1 lines)
>However, there can also be non-Guix processes filling the disk, to the
point where it’s completely full, and at that point sqlite3 (which the
daemon uses) may be unable to operate.

I didn't experience this. Guix pull filled the disk, which prevented
the gc from working. It's possible some other process was writing in
the background, but I had built an image which was almost completely
devoid of programs and services.

Toggle quote (4 lines)
>I’m afraid there’s little we can do in this case.

>Thoughts?

Copy the database into tmpfs temporarily?

On Tue, Dec 22, 2020 at 8:37 AM Ludovic Courtès <ludo@gnu.org> wrote:
Toggle quote (21 lines)
>
> Hi,
>
> Nathan Dehnel <ncdehnel@gmail.com> skribis:
>
> > It would be better if guix gc could run on a disk that was completely
> > full, as right now it cannot be used to free space on a full disk.
>
> The daemon reserves a bit of extra space before starting operation (see
> ‘reserve-space?’ in (guix store)), which should be enough to gracefully
> handle situations where builds are filling the disk.
>
> However, there can also be non-Guix processes filling the disk, to the
> point where it’s completely full, and at that point sqlite3 (which the
> daemon uses) may be unable to operate.
>
> I’m afraid there’s little we can do in this case.
>
> Thoughts?
>
> Ludo’.
L
L
Ludovic Courtès wrote on 16 Jan 2021 15:22
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control message for bug #45266
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severity 45266 important
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Ludovic Courtès wrote on 16 Jan 2021 15:23
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(address . control@debbugs.gnu.org)
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merge 45266 41484
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Vincent Legoll wrote on 12 Mar 2021 05:56
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Re: "guix gc" needs free disk space to function
(address . 45266@debbugs.gnu.org)
CAEwRq=rGivtBbp9F7OX4ckZii20oiFySikU7bV0E+k2jpAkRZw@mail.gmail.com
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Hello,

for the guix daemon sqlite problem, could we
preallocate some space in the database also ?

c.f.: https://stackoverflow.com/questions/827010/sqlite-pre-allocating-database-size

--
Vincent Legoll
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