RasGas deployed a High Availability PI Server for the PI System in March 2010 to meet a number of growing business needs and challenges. RasGas chose PI HA to address the growing number of users, interfaces, and data and to take advantage of the latest PI System visualization tools while maintaining data security. The project was executed in two phases; Phase 1: Upgrade DCS interfaces and PI Server to PI HA and Phase 2: Implement PI System monitoring tools such as PI MCN, PI AF, and PI Notifications. This presentation shares RasGas experience in executing this project, with challenges and lessons learned.