A black hole and a mountain of data
With enormous technical effort, an international research group recently managed to photograph a black hole. The news quickly spread across every news site. No matter if it’s the New York Times, Guardian, NZZ, Luzerner Zeitung or the Hindustan Times, black holes are en vogue.
While reading a Spiegel Online article, I stopped short:
What? By post?!
This is how the Event Horizon Telescope (EHT) was set up: various telescopes around the globe worked together to create an enormous virtual telescope with a diameter of 8’000 kilometres. They all collected data. These mounds of data were then shipped from place to place. The quote doesn’t indicate the true extent of this data mountain, only mentioning Petabytes.
The value can instead be seen in this picture displaying the scientist responsible for compiling the image: 5’242’880 Gigabytes of data were collected by the telescopes all in all.
Let’s assume that an observatory at the South Pole collected 1 Petabyte of data. Let’s also assume there to be a Gigabyte pipeline from the South Pole to the Max-Planck Institute. 1 PB is 1’000’000’000 MB. 1 GBit/s is 125 MB per second. Transferring a single Petabyte of data between these locations would take 92.5 days.
Funnily, a transport vehicle or small airplane filled to the brim with hard drives has a pretty high data threshold. I’m hereby assuming a Petabyte to be transported in a Douglas DC-6. This airplane has a 6’200 km reach requiring 3 fuel stops, taking two hours, let’s say. At 500 km/h, flight time would amount to 32 hours. All in all, 38 hours. Add four more hours to transport the data from the airport to the Max-Planck Institute. The data threshold would average out at 6.5 GB per second. Not bad.
This strategy of transporting data physically even has a name: Sneakernet.
Now it’s your turn
Want to beef up your NAS (German article by Martin Jud!) in order to save your own black hole data? No problem, get 656 WD Red 8 TB hard drives for the low low price of CHF 183’024.–
All in all, they weigh less than half a tonne and can be comfortably transported in this Hi-Tec van: