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Data Storage

Submission + - How Facebook Stores Billions of Photos (flowgram.com)

Submitted by
David Gobaud
David Gobaud writes: "Jason Sobel, the manager of infrastructure engineering at Facebook, gave an interesting presentation titled Needle in a Haystack: Efficient Storage of Billions of Photos at Stanford for the Stanford ACM. Jason explains how Facebook efficiently stores ~6.5 billion images, in 4 or 5 sizes each, totaling ~30 billion files, and a total of 540 TB and serving 475,000 images per second at peak. The presentation is now online here in the form of a Flowgram."
Software

Submission + - Software Diagramming in Embedded Systems

Submitted by afd100
afd100 writes: I work for a medium sized company building embedded systems using C. As of yet, we do not have a great design methodology, but it is something we're working on. For the last 7 years now, we've been documenting our embedded software in an IEEE'esque Software Detailed Design, and using a very cryptic block diagram to explain our software. What does the embedded software community at large currently use to graphical represent their software or do they even try this? Since the programming is functionally decomposed, is UML the right way to go?
Power

The Last DC Power Grid Shut Down in NYC 533

Posted by Zonk from the edison-we-barely-knew-ye dept.
cell-block-9 writes "Today the last section of the old Edison DC power grid will be shut down in Manhattan. 'The last snip of Con Ed's direct current system will take place at 10 East 40th Street, near the Mid-Manhattan Library. That building, like the thousands of other direct current users that have been transitioned over the last several years, now has a converter installed on the premises that can take alternating electricity from the Con Ed power grid and adapt it on premises.' I guess Tesla finally won the argument."

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