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Availability management aims to define, analyze, plan, measure, and improve all aspects of the availability of IT services. It is also responsibility for ensuring that all IT infrastructure, processes, tools, roles, and so on, are appropriate for the agreed-upon availability targets.
Most virtualization platforms allow for the management of system availability and can act in the event of a system outage (such as vMotion).
If the release were not to go as planned, any negative impacts on system availability would have to be identified, monitored, and remediated as per the existing SLAs for the services and systems affected.