Redundancy
- Redundancy: duplication of critical data or services with the intention of increased reliability of the system.
- Server failover
- Remove single points of failure and provide backups (e.g. server failover).
- Shared-nothing architecture
- Each node can operate independently of one another.
- No central service managing state or orchestrating activities.
- New servers can be added without special conditions or knowledge.
- No single point of failure.