What is Uptime and High Availability?

Definition: Uptime is the share of time a system is available to users, shown as a percentage. High availability (HA) is the design approach that keeps a platform running when individual components fail.

What uptime percentages mean per year:

99.9% - about 8.8 hours of downtime.
99.95% - about 4.4 hours.
99.99% - about 53 minutes.

How high availability is achieved:

Redundant servers and databases with automatic failover.
Load balancing across several instances.
Hosting across separate data centres or availability zones.
Monitoring and alerting around the clock.

Why it matters: downtime during live events stops betting and deposits at the busiest moments, so uptime targets are written into the SLA.

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What is Uptime and High Availability?

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