uptime
Decoding 99.9%, 99.99%, and 99.999%: what uptime SLAs really mean
Every infrastructure vendor advertises uptime percentages, and the difference between 99.9% and 99.99% sounds trivial. It's not — one allows nearly 9 hours of downtime per year, the other allows under an hour. Here's how to read the numbers and what each tier actually costs to deliver.
MyUptimeBot Team
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November 20, 2025
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5 min read