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Month: April 2009

Google Servers

I always wanted to know more about the customized Google servers. The cool part is that they have implemented a distributed UPS (each server has his own battery and charge controller): Instead of having a centralized UPS, Google integrated a battery into every server with a charge controller and test circuit. The battery is sealed lead-acid. Basically, it is a car battery. The goal is to keep the server running for “about a minute” until the generator turns on or the A/C power source is switched. The power supply ONLY provides 12VDC (notice the yellow 12V wires coming out of the power supply), and the power only goes to the motherboard. The motherboard then directly supplies power to the disks (at 5VDC) and no other voltage conversions occur (with the exception of 1.2-1.8V for the processor). As such, the AC feed of either 208VAC or 230VAC flow directly to the…

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Elite prompt

Today, I was changing some stuff on my server, stopped for a moment and stared at the bash prompt: [[email protected] root]# God, I would really love to read again Cryptonomicon. But I still have to finish Quicksilver and all the Baroque Cycle thing. Damn it, Neal.

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