How to achieve high reliability?

Difference between Reliability and Availability:

Redundancy: Use redundancy to ensure that there are multiple copies of critical components, which can help ensure that the system can continue to function even if one or more components fail.
Scalability and Maintainability: It means designing systems that can continue to function well as they grow and evolve over time.
Fault Tolerance: Design systems with fault tolerance in mind, which means building in mechanisms that can detect and recover from faults automatically.
Monitoring and Analytics: Use monitoring and analytics tools to track system performance and identify potential issues before they become major problems.
Load Balancing: Use load balancing to distribute workloads across multiple systems, which can help ensure that no single system is overwhelmed and can help prevent failures due to high traffic.

Reliability in System Design

The reliability of a device is considered high if it has repeatedly performed its function with success and low if it has tended to fail in repeated trials. The reliability of a system is defined as the probability of performing the intended function over a given period under specified operating conditions.