CME Data Center Woes Started 12 Hours Before the Market Opened

The owner of the data center that serves CME Group Inc. started experiencing technical problems about 12 hours before an outage in its cooling system took down global markets, according to a confidential report reviewed by Bloomberg.

CyrusOne, which runs the data center in the suburbs of Chicago, first told clients including the exchange about the emerging problems at 4:19 a.m. Central time on Nov. 27, the analysis of the outage’s root causes showed. That was a day US markets were closed for the Thanksgiving holiday.

The data center operator, owned by private equity firms KKR & Co. and Global ...