Re: Proposal: Faster composes by eliminating deltarpms and using zchunked rpms instead

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On Mon, 2018-11-19 at 22:18 +0100, Nicolas Mailhot wrote:
> Le lundi 19 novembre 2018 à 20:30 +0000, Jonathan Dieter a écrit :
> > The zchunk advantage over deltarpms is much less CPU usage, while its
> > disadvantages are slightly larger network usage and increased disk
> > usage.
> 
> Unfortunately, that's a bad compromise for most limited clients. A
> limited client can trade time for CPU or network performance, swap for
> memory. What it can absolutely not make more of is storage, both install
> and staging storage. Install storage requirements do not depend on rpm
> tech level, but will generally go up over a system lifetime, adding
> pressure on staging storage.
> 
> So you absolutely need to keep staging storage on par or less than
> existing rpm/dnf if you do not want to obsolete classes of Fedora
> hardware.
> 
> And Google released a huge quantity of cheap storage-deficient hardware
> with its chromebooks. People do install Fedora on those.

The only way we can keep staging storage down (and it would actually be
less than deltarpm/normal rpm) is to use the local chunks at install
time rather than download time.  This comes with its own risks though,
see the other emails in this thread, specifically the ones following
Jan Pokorný's message.

Jonathan
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