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I appreciate this argument, and let me give the counter-example. 99.5% uptime is good enough for nearly all businesses. I run a small IT service company - we provide a hosted service in the insurance industry. We host on-premise, in our physical office (well, across 2 offices for DR). I personally have a history in infra management, so I generally enjoy it. You're right that sometimes things go wrong. Last year, we w…
>99.5% uptime is good enough for nearly all businesses. I don't know what your business is, but as a presales engineer in the ecommerce field, if our SLA was 99.5% we wouldn't even make it past the first round of vendor selection.
As you know, the SLA isn't the same as the downtime. It just means the threshhold where you'd start paying back some credits for missing the SLA (only to customers who notice and ask). Which is often cheaper than building the infrastructure to actually support the promised SLA.