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Reliability (Fault Tolerance (Fault types (Environmental, Operational,…
Reliability
Fault Tolerance
Mean time to event
Module availability
Fault types
Environmental
Operational
Maintenance
Hardware
Software
Process
Civil Wars
Schemes
Failvote
Failfast
N-plex repair
Old master - new master technique
Software reliability
Distinction between hardware and software reliability
N-version programming
Transactions
Each program written as an ACID transaction with consistency checks
Bugs
Bohrbugs
Heisenbugs
Dense faults
Byzantine faults
Improving software reliability
Process pairing
Periodic transfer of data
Checkpoint-restart
Checpoint messages
Persistent
Highly available storage
Highly available processes
Improving communication reliability