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Advances, Systems and Applications

Journal of Cloud Computing Cover Image

Table 2 Metrics for HA evaluation from [8]

From: High availability in clouds: systematic review and research challenges

Metric Definition
Reaction time Delay between the occurrence of the failure and the first reaction of the availability management solution.
Repair time Duration from the first reaction until the faulty entity is repaired.
Recovery time Duration from the first reaction until the service is provided again
Outage time Time between the failure happening and the service recovery. In other words, outage time is the amount of time the service is not provided and it is the sum of the reaction and recovery times.