High availability in a computer system refers to resource availability following which event?

High availability in a computer system is primarily focused on ensuring that the system remains operational and accessible, despite unexpected events that can cause disruptions. The concept emphasizes minimizing downtime and allowing users to access necessary resources continuously.

In the context of high availability, the event that most directly aligns with this definition is a failure or shutdown. A failure could refer to hardware malfunctions, software crashes, or other unforeseen incidents that lead to an outage. Solutions aimed at achieving high availability, such as redundancy, failover mechanisms, and clustering, are implemented specifically to mitigate the impact of these disruptions and maintain service continuity for users.

While events like routine maintenance, system upgrades, or even power surges can also affect system availability, high availability strategies are explicitly designed to address unexpected failures and ensure that the system can recover quickly or switch to backup resources to maintain access. Therefore, focusing on failures or shutdowns is central to understanding high availability as a concept in computer systems.