Core Viewpoint - The CME Group faced significant operational disruptions due to a cooling system failure at its Aurora, Illinois data center, which has since been addressed with additional backup systems installed by CyrusOne [1][2]. Group 1: Incident Overview - A catastrophic cooling system failure occurred at the data center complex late Thursday, causing temperatures to exceed 100°F (38°C) [2]. - The CME Group's disaster recovery plan included a move to a New York area data center, but the exchange chose not to switch facilities, believing the outage would be brief; however, it lasted for several hours [2]. Group 2: Operational Recovery - Most operations were restored by Friday afternoon US time, with the Commodity Futures Trading Commission monitoring the situation [3]. - CyrusOne has confirmed that stable and secure operations have been restored at the Chicago 1 (CHI1) data center, and additional redundancy has been added to the cooling systems to enhance continuity [1].