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Availability in the cloud service system represents the quick and rapid delivery of applications to the user. Businesses and enterprises need to maintain quick delivery of applications to their users, as downtimes (no matter how short) can cause an irrecoverable loss to an enterprise.

A general service-level agreement between a provider and a business will specify the rate or downtimes of the applications or service. It can be 99.999% or 80%. More resources can be provided to maintain this agreement [20].