Has an impact on only a portion of the user base,.Is due to external factors beyond the companies control like the DDoS attack on Dynamic Network Services in 2016 that brought down Twitter and other large services such as Spotify,.found that users accept and forgive unexpected downtime when the outage: A Microsoft study in partnership with Psychster Inc. When it comes to making your users happy, anything less than 100% uptime is pushing it, but studies have found that users can forgive the occasional downtime. Occasional downtime is forgivable if handled correctly Typically these calculations do not include scheduled downtime, but from a customer perspective for the most part downtime is downtime. Other providers establish high availability as low as 99.8% allowing for nearly 18 hours of unexpected downtime a year. At 5-9s, a site may experience up to 5.26 minutes of downtime per year. Many providers aim for 5-9s (five nines) or 99.999% uptime or better.

The percentage of uptime that constitutes high availability is a bit of a moving target.

So, what is “high availability?” Availability is a ratio of unplanned downtime versus the time a website or service is accessible and, in some cases, functional. Of course, Facebook isn’t hurting for users, but downtime is just additional tarnish on Facebook’s reputation after the Cambridge Analytica controversy. For example, according to Facebook experienced five hours of downtime in the first nine months of 2018.

Of course, the goal is always 100% uptime, but 100% is a lofty goal even for the big players like Google, Amazon, and Microsoft. You don’t want to see Twitter lighting up with posts like the one below. Maintaining high availability is a bit of a no-brainer, but if your users can’t rely on your site or service to be there when they need it, they will find an alternative they can trust. We’ve got some tips to help you get there. I.e., website and API uptime, performance, and function matter. Want to know how to make sure your website, web application, or API makes you stand out against the competition? It isn’t all about offering innovation (not that innovation doesn’t help), but taking what you do offer and making it the best.

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