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First you will need those Pi boards - they became scarce and cost a lot...
"If builders built buildings the way programmers wrote programs, then the first woodpecker that came along would destroy civilization." ― Gerald Weinberg
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The Raspberry PI was a throw away computer, you find them being used in place of microcontrollers as they are easier to program(!). 
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Now if this cluster was for the Pi Zero that would be something. Small, cheap and as far as I know available.
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Programming them sucks though, and you'd have to find a way to network them.
Or you could use an ESP32 and its ESP-NOW wireless mesh to handle the traffic.
To err is human. Fortune favors the monsters.
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Back in the days of DEC you could cluster there computers, was an awesome setup.
Too bad they went under, they were great machines.
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HP still keeps OpenVMS alive. Somewhat unwillingly. They cancelled the Hobbyist Program again, so I can no longer get licenses for my systems.
Unsure whether or not the referenced technology is similar to a DEC cluster or more like a QNX cluster -- in which (if I recall correctly) you can essentially have one logical computer spread across multiple devices.
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At one time I had thought about getting a uVAX but things happened and I got cast into another dimension so to speak.
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The first uVAX I worked on was around 86,don'tremember the model, but quit the company not long after they got it and I moved to Florida to work on a PDP 11/23. Like going from a Cad to a Pinto!
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I used PDP-11s in high school and some college, then VAX-11.
My co-op job in college was managing a MicroVAX 3600 -- their PDP-11 was sitting cold and unused by that time.
Then I used mostly VAX and Alpha until 2002. Just a hobbyist since then.
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I used VAX-11 too...
diligent hands rule....
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ditto mike. amazing os
"A little time, a little trouble, your better day"
Badfinger
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Upgrading this site's hosting setup?
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
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A couple years ago I had set up a 3-rPi cluster where one was hosting an ngix server, ideally to route different domains coming in on the same public IP to different web applications, which was working great. The second rPi was the database server and had an external SSD connected to it, and the third rPi hosted the actual web apps. All was working, then a traumatic event happened in my life and the project and Code Project articles I had planned to write went to the wayside. It was sad. I hope I still can find my notes on how all this was configured when at some point I resurrect this project.
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Look up Jeff Geerling on the various platforms - youtube. He has been reviewing different housing / backplane for the Pi family.
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Well I'm pretty sure you can use OpenMPI on any Raspbian distribution but I think, alternatively, OpenCL is available on the Pi3 (and I heard Vulkan has parallelism, so you can use that on the Pi4).
In short, anything that would've required a cluster of 4 SGI workstations back in the day. Probably a cool, portable, quick and dirty render farm?
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cool ideas!
diligent hands rule....
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Southmountain wrote: What kind of projects can we do on this?
I would say that is exactly the question - why would you want to do that?
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because this is a cluster, I am thinking to run some machine learning model to absorb a knowledge in a specific domain...
diligent hands rule....
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How about calculating Pi? 
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You could do data mining with an open source tool that can do parallelism to distribute the compute capabilities among all the cluster members. You could as well load balancing for Web Apps. Many posibilites limited by your imagination.
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I'm all into the cluster thing - but that's a really big word technically. DEC had the tech for clustering. That said, negative feedback on the product - for $80 you get a frame you can plug boards into. Okay, I get that.
Where are the boards? The listing implies you get 4 boards, but I don't think so.
Many years ago, I worked in the land of VME. By definition - if you had a VME board, it adhered to that standard. Rolling out a product based on this, I would hesitate. Heck, most pi boards do quite well performance wise, so why do I need a cluster?
Charlie Gilley
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
Has never been more appropriate.
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thank you for sharing this![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
diligent hands rule....
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