Title: Does anyone have data that would suggest how long it takes an org at the scale of an Amazon, Google, or Facebook to entirely replace their HW?<p>I know that current practice at that scale is to not replace an individual chassis, only whole racks when a certain % of servers have failed, but that can&#x27;t be the whole story, since presumably servers&#x2F;racks are replaced if they are old enough even if they happen to still be running OK.<p>Google for example almost certainly has no servers (or switches, etc.) running that date back to Y2k even though statistically, <i>some</i> 16-year-old HW would still be working if it hadn&#x27;t been yanked.<p>So, assuming the HW hasn&#x27;t actually failed, how old is <i>too</i> old for a &quot;web-scale&quot; company to keep around? And is the answer different for these companies&#x27; own services vs. externally facing IaaS&#x2F;PaaS?
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