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Re: bandwidth and space required to sync a basic mirror


What is related to disk utilization, I can offer my graph which I
implemented since the debian.mirror.vu.lt was launched. The data is
gathered nightly but the "steps" in the graph are wider:


I hope it helps you to see the trends - 3+ years period, I think, is
sufficient time window. Please note that this also includes other

If you still would like to see a Cacti graph instead - don't hesitate to
ask, either personally, or via this mailing list.

As for bandwidth - it depends on many factors and the state of Debian
release or any other event. Generally, the "outdated" data you mentioned
is about accurate, I'd say.

As for bandwidth for users (note, that is also an alias for
ftp.lt.debian.org) - generally average upload bandwidth is about 3.5-4
megabits per second (during one day / 24 hours period). I have rarely
seen momentary spikes over 80 megabits/s. Oh, and the mirror is capable
to provide over 900 mbps, we've tested that from multiple locations.

maybe someone else will chime in and provide more useful/accurate data.

Hope that helps.


On Wed, 2013-11-20 at 13:31 -0500, anarcat wrote:
> Hi,
> I was wondering what were the basic requirements for running a mirror
> these days.
> Here is the information that I found:
> Disk space
> ==========
> This is well documented[1]. For a full mirror, the disk space required is
> currently 886 GB. On top of that, you need to add 44 GB for security, 55
> GB for backports and 15GB for "CD images". This adds up mysteriously to
> 1000GB - coincidence? :)
> However, it is not clear how disk space is growing, so provisionning
> such a server, even in the medium term (a year) could be difficult.
> Munin/Cacti graph of the disk usage from an existing mirror for the last
> year would be awesome here, for example.
>  [1]: http://www.debian.org/mirror/size.en.html
> Bandwidth for updates
> =====================
> It is unclear how much data is transfered on a daily or (ideally)
> monthly basis for updates to the archive. I found a graph[2] which seem
> to show the size transfered varies between 2 and 15 GB on a daily basis,
> but that data is old (2012-08-12) and it's hard to get a good idea of
> what it actually means - what's the average, for example? Or better,
> what's the 95th percentile?
>  [2]: https://ftp-master.debian.org/size-quarter.png
> Bandwidth for users
> ===================
> I assume this is the hardest part to figure out, as this will vary
> wildly according to the region you're in and the relative popularity of
> your mirror.
> The official mirror page[3] states that you need a "T1 or better" (for
> the record and those who weren't around in those days, a T1 is
> 1.5Mbit/s). I hardly think this requirement is fit for a public mirror
> these days. :) The official page does mention this requirement is
> "higher" for "developped countries", but fails to clarify that
> requirement.
>  [3]: http://www.debian.org/mirror/official.en.html
> Of course, this is hard to figure out. But pointers about how the
> biggest *and* the smaller mirrors per continent generally take right now
> would be useful. Again, bandwidth graphs would be incredibly useful.
> Cheers,
> A.

Arnoldas Šareckis <Arnoldas.Sareckis@ittc.vu.lt>

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