Session 03

Categorization of Quality Attributes
- Operational
- Structural
- Cross-Cutting
Least Worst Combination of Trade-offs
Availability
- Fault - Failure
- Fault-related concerns
  - Risks associated with Faults
    - Minor
    - Major
    - Critical -> Disasters
  - Frequency
- Responses to Faults
  - Prevent
  - Tolerate
  - Remove
  - Forecast
- Availability General Scenario
  - Source -> Internal, External
  - Stimulus -> Fault
  - Artifacts -> (Processor, Storage, Communication Channel, etc.)
  - Environment -> (Normal, Overloaded, Special Occasions, Degraded, etc.)
  - Response -> (Prevent, Detect, Recover, etc.)
- Occasionally Connected Systems
- SLA (Service-Level Agreement)
  - Service-Level Failure
- Tactics for Availability
  - Detection
    - Monitoring, Ping, Health Checks, etc.
    - Condition Monitoring -> Assumptions, Edge Cases
    - Tests, Checks, Validations
  - Prevention
  - Recovery