99.999 Availability And Real World Outages__removed

## Amazon S3’s SLA Promise Amazon S3, one of AWS’s flagship services, has a **Service Level Agreement (SLA)** that guarantees a **monthly uptime percentage of at least 99.9%**. If availability falls below that threshold, AWS provides **service credits**: - **99.0% – 99.9% uptime:** 10% credit - **95.0% – 99.0% uptime:** 25% credit - **Below 95.0% uptime:** 100% credit This is a **contractual guarantee**, not an engineering aspiration. It’s important to note that **99.9% uptime** still allows for **~8 hours, 45 minutes of downtime per year**. This value is far from the “five nines”.