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High availability software is software used to ensure that systems are running and available most of the time. High availability is a high percentage of time that the system is functioning. It can be formally defined as (1 – (down time/ total time))*100%.
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.
In information technology, high-availability application architecture is a process followed when implementing a new application into an existing business-wide computer system or ERP while minimizing downtime. ff The architecture contains three stages: development, quality assurance, and production.
This was cured with version 2 of the software, which added n-node clusters, resource monitoring, dependencies, and policies. Version 2.0.0 came out on 29 July 2005. [ 5 ] This release represented another important milestone as it was the first version where very large contributions (in terms of code size) were made by the Linux-HA community at ...
Veritas Cluster Server (rebranded as Veritas Infoscale Availability [1] [2] and also known as VCS and also sold bundled in the SFHA product) is high-availability cluster software for Unix, Linux and Microsoft Windows computer systems, created by Veritas Technologies.
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 ...
Pacemaker is an open-source high availability resource manager software used on computer clusters since 2004. Until about 2007, it was part of the Linux-HA project, then was split out to be its own project.
OpenSAF defines a set of building blocks, collectively providing a mechanism to manage Service Availability (SA) of applications based on resource-capability models. [20] SA and High Availability (HA) is the probability of a service being available at a random point in time; mission-critical systems require at least 99.999% (five nines ...