March 2007
Intermediate to advanced
326 pages
9h 3m
English
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Gathering Availability Requirements
Asking the sponsors of your system, “How highly available should this be?” probably results in one of two answers. The less experienced sponsors will simply reply, “100%.” The more knowledgeable will say, “five nines” because it sounds cool and technical. But are five nines really required?
The proper way to frame the availability decision is in straightforward financial terms: actual cost vs. avoided losses. For example, “98% availability” translates to 864 minutes of downtime each month. That downtime has a direct cost because of lost revenue. Suppose the site brings in $1,500 per hour during the peak of the day—the worst possible time to be down. Then the worst-case loss with 98% availability is about ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.