2 High Availability Mecanisms
To increase the availability of a software solution, mechanisms must be put in place. These mechanisms can increase the availability of the solution in specific contexts; these contexts must be circumscribed in order to determine the applicability of each mechanism. The implementation of these mechanisms affects the virtual components. The method of analysis will be enhanced by adding new features to virtual components, so that they can meet the new requirements demanded by the implementation of these mechanisms.
Contents · 9/26
- Design for High Availability
- Introduction
- 1 Hardware Abstraction
- 1.1 Isolating the levels of abstraction
- 1.2 Physical components category
- 1.3 Virtual Layer
- 1.4 Abstraction of virtual components
- 1.5 Characteristics of virtual components
- 2 High Availability Mecanisms
- 2.1 Framework for analysis of the mechanisms and assumptions
- 2.2 Public interface of a solution
- 2.3 Risk Control
- 2.4 One approach: duplication
- 2.5 Limits of replication of immutable virtual components
- 3 Evaluation of downtime risks
- 3.1 Dependency hierarchy
- 3.2 Bottlenecks
- 3.3 Method for calculating availability
- 3.4 Methodology of analysis
- 4 Evaluation in real cases
- 4.1 Basic software solution
- 4.2 Analysis without assumptions
- 4.3 Evaluation with addition of availability assumptions
- 4.4 Assumption in a cloud scenario
- Conclusion
- References