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Advances in information technology have created a broad spectrum of opportunities to increase uptime and reduce outages of critical information systems. Many applications are now designed with features that reduce the complexity of implementing redundancy. Advances in network technology have increased the availability and cost effectiveness of implementing geographic redundancy. Replication features are now commonly available in storage systems. Virtualization technologies have created opportunities to move servers electronically across the network, rather than physically. Cloud Computing services have become mature and abundant, creating opportunities to outsource strategic functions to a distributed ‘cloud’. With proper analysis and design, Highly Available Information Systems are within reach for most organizations.