And there's much new fun to be had when you have this many servers around. For example - once you start shuffling around tens of petabytes a day you quickly not

And there's much new fun to be had when you have this many servers around. For example - once you start shuffling around tens of petabytes a day you quickly notice that bit flips are very real. Computers do what we tell them to do with incredibly high probability, but it is always below 1.