Googles Datacenters on Punch Cards

Großartiges Ding in Randall „XKCD“ Munroes What If?-Serie: „If all digital data were stored on punch cards, how big would Google's data warehouse be?“ Und die NSA nimmt er sich dann auch noch kurz vor.

Based on datacenter power usage and spending estimates, my guess would be that Google is currently running—or will soon be running—between 1.8 and 2.4 million servers.[…] If we assume that each server has a couple[9] of 2 TB disks attached, we come up with close to 10 exabytes[10] of active storage attached to running clusters. […] Let's assume Google has a storage capacity of 15 exabytes, or 15,000,000,000,000,000,000 bytes. A punch card can hold about 80 characters, and a box of cards holds 2000 cards.

15 exabytes of punch cards would be enough to cover my home region, New England, to a depth of about 4.5 kilometers. That's three times deeper than the ice sheets that covered the region during the last advance of the glaciers. That seems like a lot.

Google's Datacenters on Punch Cards