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I'm more interested in the built in atomic clock and gps synchronization. Could this make one of Googles data clusters a more broadly available commodity?

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I don't quite understand your question but if you're just interested in a Stratum 1 time server you can build it yourself with an rPi and a GPS.

I'm referring to Google's Spanner database, which relies heavily on time (and thus GPS calibrated atomic clocks) for consistency across DCs.

https://en.wikipedia.org/wiki/Spanner_(database)

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