[volunteergrid2-l] Network speed on volunteergrid2

[Shawn Willden]

Hi Vlastimil!

2011/9/23 Vlastimil Ovčáčík <v.ovcacik at gmail.com>

> I'm new to this mailing list and I am thinking of joining volunteergrid2
> (if you are opened).


We are actively seeking more members/storage nodes.


> The idea is to use volunteergrid2 as my backup. I'd like to share/give 1 TB
> and store 300 GB in (3-10 settings).


Sounds perfect.


> My ISP will soon upgrade my connection to 20/20 Mbps (which will be
> effectively 15/15 Mbps or more).


Should be just fine.


> The only requirement I can't actually meet is 95 % uptime, it is rather 50
> - 60 %.


Hmm.  50-60% uptime is pretty low availability.  One of the key goals of
this grid is to achieve high availability for both reads and writes.  Thanks
to Tahoe, read availability should be near-perfect even with a few nodes
down, but write availability is a different matter; we really need to ensure
that most of the grid is always available.  Even with 95% per-host uptime,
with 20 hosts at least one host will be down 65% of the time.  If we were to
accept 60% uptime we'd always have multiple hosts unavailable.

Is there something you can do to improve that uptime number?


> I am located in Czech Republic.
>

Cool!  We like wide geographic distribution.


> 300 GB is lot of data and I would like to know what's the average/typical
> network speed on volunteergrid2? I would really like to know the speed
> regardless you are open or I am fitting candidate.


I usually get around 100-110 KBps upload speeds.  My upstream bandwidth is
about 50 Mbps, so it's Tahoe inefficiency which is the limiting factor, and
you can probably expect the same.  At that rate, it takes about one month of
uploading 24x7 to upload 300 GB.

I use some software I wrote that allows me to upload multiple files in
parallel, which allows Tahoe to make better use of my available bandwidth.

-- 
Shawn
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