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2. High availability - Wikipedia

   en.wikipedia.org/wiki/High_availability

   High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [ 1 ] There is now more dependence on these systems as a result of modernization.

3. High availability software - Wikipedia

   en.wikipedia.org/wiki/High_availability_software

   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 ...

4. High-availability cluster - Wikipedia

   en.wikipedia.org/wiki/High-availability_cluster

   High-availability clusters (also known as HA clusters, fail-over clusters) are groups of computers that support server applications that can be reliably utilized with a minimum amount of down-time. They operate by using high availability software to harness redundant computers in groups or clusters that provide continued service when system ...

5. Data centre tiers - Wikipedia

   en.wikipedia.org/wiki/Data_centre_tiers

   Most commercial data centers are Tier III; instead of using Tier IV datacentres, many large service providers typically use multiple availability zones to implement of their services, thus achieving greater resilience than would be possible with any single data centre. [citation needed] The data center tier system was created by the Uptime ...

6. Cloud computing - Wikipedia

   en.wikipedia.org/wiki/Cloud_computing

   Gartner defines a hybrid cloud service as a cloud computing service that is composed of some combination of private, public and community cloud services, from different service providers. [64] A hybrid cloud service crosses isolation and provider boundaries so that it cannot be simply put in one category of private, public, or community cloud ...

7. Reliability, availability and serviceability - Wikipedia

   en.wikipedia.org/wiki/Reliability,_availability...

   Reliability, availability and serviceability (RAS), also known as reliability, availability, and maintainability (RAM), is a computer hardware engineering term involving reliability engineering, high availability, and serviceability design. The phrase was originally used by IBM as a term to describe the robustness of their mainframe computers.