How to Evaluate High Availability Options for Virtualized IT Environments
One upside to virtualization is that it puts more applications on fewer servers. One downside is that the availability of those servers become of greater importance.
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3 tips for making highly available systems in Amazon's cloud
Amazon Web Services makes a big deal out of its availability zones, recommending that customers use multiple AZs to build clouds that are tolerant of failures like the one the company recently experienced.