Fault-tolerant equipment
Fault-tolerant equipment exploits different sparing architectures, including redundant hardware with shared loads, duplex hardware in standby mode, triplex hardware with voting. True fault-tolerant system supports six key elements of reliability:
- No single point of failure
- No single point of repair
- Fault recovery
- 100% fault detection
- 100% fault isolation
- Fault containment
The combined reliability of redundant fault-tolerant system can reach as far as 1*109 MTBF (1 billion hours before failure in average).