[FoRK] serving ~30 TB/month
J. Andrew Rogers <
andrew at ceruleansystems.com
> on >
Fri Mar 17 08:53:19 PST 2006
On Mar 17, 2006, at 7:18 AM, Eugen Leitl wrote:
> A quick question: is it feasible to serve some 30 TByte/month
> (either static files, or streaming video) over a 100 MBit
> Fast Ethernet connection, or will I need 1 GBit? The
> unit of serving is some 1.5 GByte MPEG-4 video.
This is only feasible if you plan on running your link at >90% of
theoretical capacity 24x7, leaving very little headroom for bursty
traffic patterns. As a practical matter, 30TB is almost exactly the
total real bandwidth of a 100Mbit Ethernet circuit over a month.
This is assuming that the circuit is full duplex; half-duplex FastE
will fall short even if the traffic is overwhelmingly in one direction.
One of the advantages of Ethernet is that you can reliably drive it
up to ~90% of theoretical capacity without too much impact on
performance. Many other common L2 protocols can only be driven up to
around 70% of theoretical. I have seen FastE driven close to the
theoretical edge in Internet data centers when the core had enough
capacity to carry it, so as a data point I can confirm that this has
been done by others successfully.
That said, if it was my servers that needed to constantly run just
under the ceiling for 100Mbit, I would upgrade to GigE. All it would
take is a little bit of electronic dirt being picked up by the FastE
wiring to fall below the bandwidth requirements, which I have also
J. Andrew Rogers
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