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If you're not Wal-Mart, you probably don't need 99.999% uptime. Once you do the math, you will most likely find that a much more ordinary 98%, 99%, or possibly 99.9% uptime is all that is justified.
If you’re Wal-Mart and your credit card processing pipeline stops for 30 minutes during prime time, yes, the world does end. Someone might very well be fired. The business loses millions of dollars. Wal-Mart gets in the news and loses millions more on the goodwill account.
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