If i wanted to do a motherboard that held 16 or 24 raspberry-pi compute modules, could i connect them together using the onboard gig ethernet without using any magnetics? Just by using the gige output from the module going to a commercial switch chip.
You're going to at least want to AC couple through some capacitors to avoid problems with common mode / RX bias issues between the different PHYs. But if it's on-mobo you don't need to have as much of a fault voltage rating compared to standard Ethernet which IIRC specs 1 kV isolation on the transformers.
This is a great movie. Spacey is great but Jeremy Irons is fantastic. I really like the speech where he says "Speak to me like I was a golden retriever."
I think Backblazes pricing model is unsustainable and expect them (and any competitors who mimic their model) to eventually fail when the money runs out.
Racks and racks of disk drives use a lot of power and cost a lot to keep running. A better model would be storage based on tape; one of those large tape libraries (e.g. iceberg) with nearline disk space. Most of the data that gets uploaded never gets accessed, so keeping it on tape instead of spinning rust makes sense. Sure, there’s tradeoffs, but imagine how much they’d save if they could downsize their data center spending by 90%.
I think part of the reason is that they want to be able to track the images back to you. Some person in the company is probably worried that a user will generate child porn like images and distribute them on the net. When the cops eventually come calling, they want to point to the user. This probably means there is a user-id embedded somewhere in the image.
I worked on this team some years ago. It's a complicated beast, to put it mildly. Significantly more complicated than anything I've seen before or since.
That also made it an excellent proving ground for me, to be fair. I've never doubted my sysadmin skills after that.
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