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So I accidentally ordered too many Raspberry Pi's. Therefore, I built a small cluster out of them. I thought I'd write up a parts list for others wanting to build a cluster.
To start with is some pics of the cluster What you see is a stack of 7 RPis. At the bottom of the stack is a USB multiport charger and also an Ethernet hub. You see USB cables coming out of the charger to power the RPis, and out the other side you see Ethernet cables connecting the RPis to a network. I've including the mouse and keyboard in the picture to give you a sense of perspective.
Here is the same stack turn around, seeing it from the other side. Out the bottom left you see three external cables, one Ethernet to my main network and power cables for the USB charger and Ethernet hub. You can see that the USB hub is nicely tied down to the frame, but that the Ethernet hub is just sort jammed in there somehow.
The concept is to get things as cheap as possible, on per unit basis. Otherwise, one might as well just buy more expensive computers. My parts
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