CU*Answers High Availability Program Review

This document is a technical report detailing the CU*Answers High Availability (HA) Program Review conducted from May 14 to May 21, 2023. The report outlines the procedures and events surrounding the scheduled HA rollover, which is part of an ongoing business continuity program. It describes the maintenance of a high-availability core processing environment with real-time data replication between two geographically dispersed data centers. The report details the challenges faced during the rollover, including performance degradation issues and resource allocation problems, particularly with the online banking system. It explains the steps taken to address these issues, including the reversal of software updates and adjustments to network configurations. The document also includes a timeline of events, highlighting the successful upgrade of the IBM operating system and the installation of a new fiber data communications circuit aimed at optimizing data traffic. The report concludes with reflections on the event and ongoing efforts to improve the HA rollover process.