Amazon protects cloud applications by running them across multiple availability zones, but what happens when more than one zone fails?
For cloud customers willing to pony up a little extra cash, Amazon has an enticing proposition: Spread your application across multiple availability zones for a near-guarantee that it won't suffer from downtime.
"By launching instances in separate Availability Zones, you can protect your applications from failure of a single location," Amazon says in pitching its Elastic Compute Cloud service.
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Amazon EC2 Outage Calls 'Availability Zones' Into Question
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