Infrastructure high availability is extremely critical to Cloud Computing. In a Cloud system that hosts a large number of databases and applications with different SLAs, any unplanned outage can be devastating, and even a small planned downtime may be unacceptable. On May 16, 2012, I gave a guest keynote presentation High Availability Infrastructure of Cloud Computing at Oracle Architect Day Event hosted by Oracle Technology Network (OTN). This event kicked off the 2012 Architect Day series for IT solution architects. During the presentation, I covered the best practice of configuring IT infrastructure such as servers, storage, network, Operating system , also discussed the high availability architecture that system architects should consider in cloud infrastructure design. These include Oracle Real Application Cluster, Virtualization and Disaster Recovery solutions. After the presentation, I also attended the panel session and the round table session for QAs and more extensive discussions on high availability and cloud.