From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tobias Geerinckx-Rice <me@tobias.gr>
Subject: Re: hydra.gnu.org off-line for maintenance
Date: Sat, 27 Oct 2018 16:49:29 +0200
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To: Alex Vong <alexvong1995@gmail.com>
Cc: guix-devel@gnu.org, help-guix@gnu.org
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Alex,

Alex Vong wrote:
> For myself, I use the following option:
>
>   --substitute-urls='https://berlin.guixsd.org 
>   https://mirror.guixsd.org https://mirror.hydra.gnu.org 
>   https://hydra.gnu.org'

I suggest keeping only one of mirror.guixsd.org and 
mirror.hydra.gnu.org.

I don't know the story, or which one's preferable (I forgot m.g.o 
existed), but both point to the exact same server. Hitting (and 
caching?) the same box twice is probably bad news for both of you.

> I choose 'berlin.guixsd.org' to be the default because it seems 
> to build
> substitutes faster than 'hydra.gnu.org'.

I share that impression.

Kind regards,

T G-R