Advances, Systems and Applications
Table 1 High availability definitions
From: High availability in clouds: systematic review and research challenges
Reference | Definition |
|---|---|
Achieving High Availability at the Application Level in the Cloud [7] | The services provided by the applications are considered highly available if they are accessible 99.999 % of the time (also known as five 9’s) |
Managing Application Level Elasticity and Availability [25] | High availability is achieved when the outage is less than 5.25 minutes per year |
Scheduling highly available applications on cloud environments [35] | High availability systems are characterized by fewer failures and faster repair times |
Are clouds ready for large distributed applications? [36] | High availability is defined in terms of downtime that is the total number of minutes the site is unavailable for events lasting longer than 5 minutes over a 1-year period |
Software aging in the eucalyptus cloud computing infrastructure: Characterization and rejuvenation [37] | Availability is defined as the ability of a system to perform its slated function at a specic instant of time. |