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DATE 2021-12-01

HANGOUT

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MESSAGE
DATE 2021-12-15
FROM Ruben Safir
SUBJECT Subject: [Hangout - NYLXS] Fwd: Mid-December update on bordeaux.guix.gnu.org


Hi Chris,

Thanks for the update. And for the all work. :-)


On Wed, 15 Dec 2021 at 16:48, Christopher Baines wrote:

> In summary, the space issue I mentioned in the previous update has
> effectively been addressed. All the paused agents are now unpaused and
> builds are happening again.

The timing had almost been perfect. ;-)


Well, as discussed on Sept., one concern I have is about “long-term
storage” – where long-term is not well-defined and storage either.

Do you think that Bordeaux could run



? Having a redundancy about all origins would avoid breakage. For
instance, because Berlin was down yesterday morning, “guix pull” was
broken because the missing ’datefuge’ package – disappeared upstream.

Today, Guix is well covered for package using ’git-fetch’ but not for
all the others methods. The situation is improving to have a complete
fallback using Software Heritage via Disarchive. Not ready yet [1]. :-)

This redundancy about all sources appears to me vitally important.
Because if Berlin is totally lost for whatever reason, it is game over
for preserving Guix – well, recover from scattered with people’s store.

Other said, in term of capacity and priority, it appears to me worse if
0.01% source (or even just one) is missing than if some substitutes are
missing. Because I can always locally burn some CPU, but I cannot
create source code. :-)

1:


> In addition to lakefront, I've also added a 6TB hard drive to hatysa,
> the HoneyComb LX2 machine that I host. Like lakefront, it's busy
> downloading the nars from bayfront. This will act as a backup in case
> lakefront is lost.

Cool! Thanks.


> In general this is an important step in being more flexible where the
> nars are stored. There's still a reliance on storing pretty much all the
> nars on a single machine, but which machine has this role is more
> flexible now. I think this architecture also makes it easier to break
> the "all nars on a single machine" restriction in the future as well.

IIUC the design, if the proxy server is lost, then it is easy to replace
it. Right?

I remember discussions about CDN [2,3,4,5,6]. I do not know if it
solves the issue but from my understanding, it will improve at least
performance delivery. Well, it appears to me worth to give a try.


2:
3:

4:
5:
6:


> Going forward, it would be good to have an additional full backup of the
> nars that bayfront can serve things from, to provide more
> redundancy. I'm hoping the nar-herder will also enable setting up
> geographically distributed mirrors, which will hopefully improve
> redundancy further, and maybe performance of fetching nars too.

To me, one first general question about backup coordination is to define
a window for time:

- source: forever until the complete fallback to SWH is robust;
- all the substitutes to run “guix time-machine --commit=<> -- help ”
for any commit reachable by inferior: forever;
- package substitute: rule something.


Thanks for taking care about redundancy and reliance of CI.


Cheers,
simon

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