Availability (可用性)

Scalability (可扩展性)

  • Refers to the capability of a system to handle a growing amount of work, or its potential to be enlarged to accommodate that growth
  • It ensures system can handle increased load efficiently by adding resources or optimizing existing ones. It ensures that the system can grow to meet the demands of a larger user base or increased data volume, ensuring Availability
  • Can be achieved with Cache Server, Stateless Compute Server, Message Queue (消息队列) & Database Scaling

Vertical Scaling

  • Basically adding more CPU and Main Memory to a single Server
  • Simple to implement, great option when traffic is low

Vertical Scaling Limitations

Hard Limit

No Failover


  • Powerful servers are much more expensive

Horizontal Scaling

Fault Tolerance (容错性)

Single Point of Failure

  • A part of a system that, if it fails, will stop the entire system from working

Reliability (可靠性)

  • Refers to the ability of a system to perform a specified function without failure over a specified period
  • It ensures consistent and predictable behavior of a system. It involves minimizing the chances of failures and, in case of failures, having mechanisms in place for quick recovery
  • Can be achieved with Monitoring and automation like ci/cd pipeline