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High Availability

High Availability = A design approach that ensures a system or service remains operational and accessible with minimal downtime, typically achieved through redundancy and failover mechanisms.
Redundancy = The duplication of critical components or systems to ensure service continuity in case of failure, such as backup servers or power supplies.
Failover = The automatic switching to a backup system or component when a primary system fails, ensuring continuous availability.
Cluster = A group of interconnected servers or systems that work together to ensure high availability, load balancing, and fault tolerance.
Load balancing = The process of distributing incoming network traffic across multiple servers to prevent any one server from becoming overloaded and to ensure optimal performance and availability.
Uptime = The percentage of time a system is operational and accessible, often used as a metric to measure the reliability and availability of a service.
Disaster recovery = A set of procedures and strategies to recover systems, data, and operations in the event of a disaster or failure, minimizing downtime and data loss.
Replication = The process of duplicating data across multiple systems or locations to ensure its availability and durability in case of failure.
Fault tolerance = The ability of a system or component to continue functioning properly in the event of a failure or malfunction of some of its parts.
Active-active configuration = A setup where all systems or servers in a cluster are actively processing traffic or workloads, providing higher capacity and availability.
Active-passive configuration = A setup where one system is active and handling requests, while the other is passive and only takes over if the active system fails.
Service Level Agreement (SLA) = A contract that defines the expected uptime and performance levels for a service, often specifying penalties for failing to meet these levels.
Redundant power supply = A backup power system used to ensure continued operation of servers and systems in case the primary power source fails.
Geographical redundancy = The practice of placing systems and data in multiple geographic locations to protect against regional disasters or outages.
Rolling update = A deployment strategy that updates parts of a system or service incrementally, without interrupting the availability of the entire system.
Business continuity = The ability of an organization to maintain its operations and services during and after a disruption or disaster, often tied to high availability systems.

#High Availability, #Redundancy, #Failover, #Cluster, #Load balancing, #Uptime, #Disaster recovery, #Replication, #Fault tolerance, #Active-active configuration, #Active-passive configuration, #Service Level Agreement, #SLA, #Redundant power supply, #Geographical redundancy, #Rolling update, #Business continuity

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