"Always-on" redirects here. For the software restriction, see Always-on DRM.
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.
Modernization has resulted in an increased reliance on these systems. For example, hospitals and data centers require high availability of their systems to perform routine daily activities. Availability refers to the ability of the user community to obtain a service or good, access the system, whether to submit new work, update or alter existing work, or collect the results of previous work. If a user cannot access the system, it is – from the user's point of view – unavailable.[1] Generally, the term downtime is used to refer to periods when a system is unavailable.
^Floyd Piedad, Michael Hawkins (2001). High Availability: Design, Techniques, and Processes. Prentice Hall. ISBN 9780130962881.
hospitals and data centers require highavailability of their systems to perform routine daily activities. Availability refers to the ability of the user...
environment. Normally highavailability systems might be specified as 99.98%, 99.999% or 99.9996%. The simplest representation of availability (A) is a ratio...
Highavailability software is software used to ensure that systems are running and available most of the time. Highavailability is a high percentage of...
2021; 2 years ago (2021-08-23) Operating system Windows, Linux, Unix, Mac Available in 10 languages List of languages English, Chinese (Simplified), Chinese...
capacity is available may or may not be deducted. Where they are deducted, the metric is titled equivalent availability factor (EAF). The availability factor...
Retrieved 2020-10-19. "Proxmox VE documentation: HighAvailability". Retrieved 2020-10-19. "HighAvailability Virtualization using Proxmox VE and Ceph". Jacksonville...
requiring highavailability are typically implemented as distributed systems that span multiple availability zones. Services offering distinct availability zones...
The availability heuristic, also known as availability bias, is a mental shortcut that relies on immediate examples that come to a given person's mind...
for Exchange Server 2007. This service pack includes an additional high-availability feature called SCR (Standby Continuous Replication). Unlike CCR, which...
Applications can use one of the available APIs to connect to a CUBRID connection broker. CUBRID HighAvailability provides load-balanced, fault-tolerant...
consistency is a consistency model used in distributed computing to achieve highavailability that informally guarantees that, if no new updates are made to a given...
IBM's solution for high-availability clusters on the AIX Unix and Linux for IBM System p platforms and stands for HighAvailability Cluster Multiprocessing...
reputation. The terms highavailability, continuous operation, and continuous availability are generally used to express how available a system is. The following...
Clustering support currently requires the JDK version 1.5 or higher. A high-availability feature has been added to facilitate the scheduling of system upgrades...
disk based database, which both employ the same SQL interface, and a highavailability option. Both in-memory and disk based engines coexist inside the same...
route availability for a line is calculated by taking into account bridge strength, track condition, structural issues and so on. A route availability of...
power availability is the hardest to change. Various metrics exist for measuring the data-availability that results from data-center availability beyond...
network of proxy servers and their data centers. The goal is to provide highavailability and performance by distributing the service spatially relative to...
CVE-2020-13849). MQTT clustering is a technique employed to ensure highavailability, fault tolerance, and scalability in MQTT deployments. As an efficient...
maintenance that could cause disruption of service may be performed. For a high-availability service, such as an Internet hosting service or Internet service provider...
at their disposal a virtual cluster of computers, with extremely highavailability, which can be interacted with over the internet via REST APIs, a CLI...
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