> Several of the Coconut failures for Alpha TC5 seem to be to do with
> mirror issues. It might be best to have Coconut use
> dl.fedoraproject.org ?

I'll let someone more knowledgeable respond to this, but I assume you're 
referring to those HTTP 404/550 issues during anaconda package download, which 
we see heavily on the Boston machine, and less frequently on the Brno machine.

In general, yes, I think it would be worth to use a specific mirror, for 
several reasons. In Boston, it might be reasonable to use dl.fp.o just to 
ensure we use the very latest package versions (otherwise the repo we hit might 
be up to 2 days old). In Brno, it might be reasonable to use our local mirror, 
even in case it's 1-2 days old, just because of the download speedups. However, 
this can't be used in all test cases. If we want to test the absolutely default 
installation, we can't set a custom mirror. If we want to test "closest mirror" 
feature, we can't set a custom mirror. In many cases, yes, it would help either 
speed or reliability.

Please note, though, that we think that the mirror issue is a legitimate bug, 
either caused by dnf stack, or anaconda. Jan reported it yesterday here:
https://bugzilla.redhat.com/show_bug.cgi?id=1196164

If this turns out to be true, it would also mean that OpenQA helped us uncover 
quite an interesting bug, which would be much harder to spot without the 
massive number of installations executed regularly. So there is also some value 
in using closest mirror as installation source.
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