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System Design · Concept

Availability

Availability describes how often a service is available. It is usually measured as uptime percentage and changes based on whether components are arranged in sequence or in parallel.

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  • Fail-over
  • Replication
  • Active-passive
  • Active-active
  • Availability in numbers

Source: GitHub - donnemartin/system-design-primer: Learn how to design large-scale systems. Prep for the system design interview. Includes Anki flashcards.. Checked 2026-11-03.