Defining High availability and Disaster Recovery

| May 18, 2012

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High availability (HA) and disaster recovery (DR) are often thought of as synonymous with each other. A highly available infrastructure component or IT system is described as “fault tolerant” or having the ability to “fail over”. An example of high availability at the component level is adding redundant power supplies. At the datacenter level adding dual UPS (A/B power) adds high(er) availability to power systems. To some, this implies the system is resilient enough to survive a disaster. Implementing high availability on its own, however, does not achieve disaster recovery. So what is the difference between High Availability and Disaster Recovery?

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