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High availability is a property of network resilience, the ability to "provide and maintain an acceptable level of service in the face of faults and challenges to normal operation." [3] Threats and challenges for services can range from simple misconfiguration over large scale natural disasters to targeted attacks. [4]
High availability software is measured by its performance when a subsystem fails, its ability to resume service in a state close to the state of the system at the time of the original failure, and its ability to perform other service-affecting tasks (such as software upgrade or configuration changes) in a manner that eliminates or minimizes ...
Continuous availability is an approach to computer system and application design that protects users against downtime, whatever the cause and ensures that users remain connected to their documents, data files and business applications. Continuous availability describes the information technology methods to ensure business continuity.
Availability, operational (Ao) [7] The probability that an item will operate satisfactorily at a given point in time when used in an actual or realistic operating and support environment. It includes logistics time, ready time, and waiting or administrative downtime, and both preventive and corrective maintenance downtime.
Availability includes non-operational periods associated with reliability, maintenance, and logistics. This is measured in terms of nines. Five-9's (99.999%) means less than 5 minutes when the system is not operating correctly over the span of one year. Availability is only meaningful for supportable systems.
Sungard Availability Services (Sungard AS) was a provider of IT production and recovery services. In 2021 it had annual revenues of approximately $773 million [ 2 ] and offices in 12 countries. [ 3 ] The company used its experience in recovery to design, build and run production environments that are resilient and available.
IT service continuity became essential as part of Business Continuity Management (BCM) and Information Security Management (ICM) as specified in ISO/IEC 27001 and ISO 22301 respectively. The rise of cloud computing since 2010 created new opportunities for system resiliency. Service providers absorbed the responsibility for maintaining high ...
Most modern business theorists see a continuum with pure service on one terminal point and pure commodity good on the other terminal point. [2] Most products fall between these two extremes. For example, a restaurant provides a physical good (the food), but also provides services in the form of ambience, the setting and clearing of the table ...