About 45 minutes west of downtown Chicago lies a rather unassuming, glass-encased data center that some of the world's largest futures and options markets depend on. By one 2018 estimate, at least $25 quadrillion of notional trade volume passes through the facility every day.

On Friday, the data center in Aurora, Ill., became infamous to all who trade across equities, foreign exchange, bonds and commodities markets globally.

A malfunction in the cooling system at the complex took down virtually all CME futures and options trading platforms, wreaking havoc for traders around the world. The complex has served as the primary hub of digital operations for the world's largest futures exchange operator CME Group Inc. for nearly two decades.

The operator of the data center, CyrusOne, said that

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