Servers powering Amazon Web Services went down last Friday evening, causing outages for Netflix, Instagram, and Pinterest, and now the company has issued a thorough explanation of exactly what happened. An electrical spike in the company's Northern Virginia data centers was the primary cause, but it was a glitch in Amazon's backup power systems that ultimately caused the servers to go dark and take down some of the web's biggest services.
The company uses a two-tiered approach to backup power — uninterrupted power supplies, commonly knows as UPS batteries, and large electrical generators. All but one data center successfully transitioned to generator power, but the one that did not continued on UPS power for as long as it could....
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