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Term in reliability engineering
In reliability engineering, the term availability has the following meanings: The degree to which a system, subsystem or equipment is in a specified operable
Availability
Systems with high up-time, a.k.a. "always on"
phenomenally high availability, which might give the illusion of continuous availability. Systems that exhibit truly continuous availability are comparatively
High_availability
Probability a system works when required
are two kinds of availability. Operational Predicted Operational availability is presumed to be the same as predicted availability until after operational
Availability_(system)
Quality of robustness of computer hardware
Reliability, availability and serviceability (RAS), also known as reliability, availability, and maintainability (RAM), is a computer hardware engineering
Reliability, availability and serviceability
Reliability,_availability_and_serviceability
The Generating Availability Data System (GADS) is a database produced by the North American Electric Reliability Corporation (NERC). It includes annual
Generating Availability Data System
Generating_Availability_Data_System
System for grading the railway network of Great Britain
Route Availability (RA) is the system by which the permanent way and supporting works (bridges, embankments, etc.) of the railway network of Great Britain
Route_availability
Measurement of the actual versus predicted uptime of a system
Operational availability in systems engineering is a measurement of how long a system has been available to use when compared with how long it should have
Operational_availability
Measure of power plant productivity
electricity. In the field of reliability engineering, availability factor is known as operational availability, Ao. The capacity factor of a plant includes numerous
Availability_factor
Bias towards recently acquired information
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
Availability_heuristic
specification. This design is generally used toward availability based contracts. Design for availability means that design process should start by given
Design_for_availability
Subset of an IT infrastructure system that shares no service-critical components
availability region is a group of data centres that are located in the same geographical region. Availability regions comprise multiple availability zones
Availability_zone
The terms high availability, continuous operation, and continuous availability are generally used to express how available a system is. The following
Continuous_availability
Explanation for types of collective belief
the availability cascade was first developed by Timur Kuran and Cass Sunstein as a variation of information cascades mediated by the availability heuristic
Availability_cascade
Information security model based on confidentiality, integrity, and availability
of confidentiality, integrity and availability. The triad is made up of confidentiality, integrity, and availability. In information security, confidentiality
CIA_triad
Standard for assessing computer system vulnerabilities
environmental scores also exist, to account for the availability of mitigations and the number of vulnerable systems within an organization, respectively. The current
Common Vulnerability Scoring System
Common_Vulnerability_Scoring_System
Use of software engineering practices for IT
infrastructure support that monitors and improves the availability and performance of deployed software systems and large software services (which are expected
Site_reliability_engineering
High-availability software is software used to ensure that systems are running and available most of the time. High availability is a high percentage
High_availability_software
Defined levels of resiliency and redundancy for IT infrastructure
as a framework for designing and classifying high availability systems. The tier classification system was created by the Uptime Institute. The four tiers
Data_center_tiers
American satellite-based radio navigation service
eliminating the need to globally degrade the system. The US then enacted a law ordering that Selective Availability be disabled on May 1, 2000; and, in 2007
Global_Positioning_System
Group of computers that run with minimum downtime
operate by using high availability software to harness redundant computers in groups or clusters that provide continued service when system components fail
High-availability_cluster
Need to sacrifice consistency or availability in the presence of network partitions
definition of availability in CAP theorem as defined by Gilbert and Lynch. Availability as defined in CAP theorem is different from high availability in software
CAP_theorem
Group of reports produced in an audit
privacy of the system. Firewalls Intrusion detection Multi-factor authentication Availability – information and systems are available for operational
System and organization controls
System_and_organization_controls
switches can connect any inlet to any outlet; this is known as full availability. Kennedy I., Lost Call Theory, Lecture Notes, ELEN5007: Teletraffic Engineering
Limited_availability
Engineering characterization of a product or system
In engineering, reliability, availability, maintainability and safety (RAMS) is used to characterize a product or system: Reliability: Ability to perform
Reliability, availability, maintainability and safety
Reliability,_availability,_maintainability_and_safety
Suite of IETF specifications
integrity, but not availability or confidentiality. As of 2026, DNSSEC deployment is spotty. The original design of the Domain Name System did not include
Domain Name System Security Extensions
Domain_Name_System_Security_Extensions
mission-critical systems. Formed in 2001, it promotes development and deployment of commercial off-the-shelf (COTS) technology. Service availability is an extension
Service_Availability_Forum
"Optimization-based Available-to-promise with Multi-Stage Resource Availability", Annals of Operations Research 135, 65-85 SAP Library on Product Availability Check
Available-to-promise
Type of denial-of-service software attack
process continually replicates itself to deplete available system resources, slowing down or crashing the system due to resource starvation. Around 1978, an
Fork_bomb
Non-functional requirements for system evaluation
transaction metric. When dealing with safety-critical systems, the acronym reliability, availability, maintainability and safety (RAMS) is frequently used
List of system quality attributes
List_of_system_quality_attributes
High-availability cluster software
Oracle Solaris Cluster (sometimes Sun Cluster or SunCluster) is a high-availability cluster software product for Solaris, originally created by Sun Microsystems
Solaris_Cluster
System that enhances the accuracy of GPS receivers
receiver autonomous integrity monitoring (RAIM). Availability is the probability that a navigation system meets the accuracy and integrity requirements.
Wide_Area_Augmentation_System
High-availability cluster software
PowerHA SystemMirror (formerly IBM PowerHA and HACMP) is IBM's solution for high-availability clusters on the AIX Unix and Linux for IBM System p platforms
IBM High Availability Cluster Multiprocessing
IBM_High_Availability_Cluster_Multiprocessing
Software that manages computer hardware resources
integrity (unauthorized users cannot modify data), and availability (ensuring that the system remains available to authorized users, even in the event of a denial
Operating_system
Operating system for mobile devices
addition to their availability on commercially available hardware, similar PC hardware-friendly versions of Android are freely available from the Android-x86
Android_(operating_system)
Israeli self-defense system
Maga is an eclectic system that has not sought to replace existing effective techniques, taking what is useful from available systems, for example: Strikes
Krav_Maga
Theorem in theoretical computer science
is partitioned, i.e. the system cannot ensure availability. In the absence of partitions, both consistency and availability can be satisfied. PACELC therefore
PACELC_design_principle
Set of computers configured in a distributed computing system
speed or availability. Computer clusters emerged as a result of the convergence of a number of computing trends including the availability of low-cost
Computer_cluster
Information technology company
Retrieved 2015-09-24. "Sungard Availability Services Data Centers". Retrieved 21 April 2023. "Sungard Availability Services Overview". Sungard AS. Retrieved
Sungard_Availability_Services
File system data structure
computer file systems, a block availability map (BAM) is a data structure used to track disk blocks that are considered free (available for new data)
Block_availability_map
System to sell airline tickets
maintained from the schedule distribution system. Changes to aircraft availability would immediately impact the available seats of the fleet, as well as the
Airline_reservations_system
Recorded state of a computer storage system at a particular point in time
API provided by the operating system to enforce exclusive read access. This is tolerable for low-availability systems (on desktop computers and small
Snapshot_(computer_storage)
Convention of symbols representing language
A writing system is any conventional system for representing a particular language using a set of symbols (called a script), as well as the rules those
Writing_system
Maximum energy available for use
potential of a system to do work or cause a change as it achieves equilibrium with its environment. Exergy is also known as "availability". Exergy is non-zero
Exergy
Historical GIS project
Information System.” Historical Methods 46(2003): 41-51 GIS boundary file availability https://www.nhgis.org/user-resources/data-availability#boundary-files
National Historical Geographic Information System
National_Historical_Geographic_Information_System
Form of government
parliamentary system is a form of government based on an executive branch dependent on the confidence of the legislative branch. In this system the head of
Parliamentary_system
Subfield of economics focusing on trade between nations
liberalization Great Trade Collapse Fair trade Triangular trade Canton System Preferential trading area Trade justice "ABSOLUTE AND COMPARATIVE ADVANTAGE"
International_trade_theory
Period when a computer system is available
measure of system reliability, expressed as the period of time a machine, typically a computer, has been continuously working and available. Uptime is
Uptime
System for people with diabetes
less insulin in general.[citation needed] Commercial availability varies by country. Approved systems in various countries, described further below, include
Automated insulin delivery system
Automated_insulin_delivery_system
This list of metro systems includes electrified rapid transit train systems worldwide. In some parts of the world, metro systems are referred to as subways
List_of_metro_systems
of operating systems, of computer devices, as listing general and technical information for a number of widely used and currently available PC or handheld
Comparison of operating systems
Comparison_of_operating_systems
Social classification practised in India
this system are the oppressed, marginalised, and persecuted Dalits (also known as "Untouchables") and Adivasis (tribals). Over time, the system became
Caste_system_in_India
Type of computerised network system
are formatted properly, checking for lower fares and watching for seat availability, upgrades, waitlist clearance, and taking advantage of back to back ticketing
Global_distribution_system
is available for Linux under the GPL. Distributed File System (Dfs) from Microsoft focuses on location transparency and high availability. Available for
List_of_file_systems
ARM-based system-on-chip by Nvidia
through NPUs in addition to GPU acceleration. RTX Spark systems were announced for availability beginning in fall 2026. Nvidia published official specifications
Nvidia_RTX_Spark
Line of high-performance computers by Dell
initially as part of the Dimension series. The first generation XPS systems were available in both desktop and tower configurations. The earliest known XPS
Dell_XPS
Sub-discipline of systems engineering that emphasizes dependability
system availability. Availability and safety can exist in dynamic tension as keeping a system too available can be unsafe. Forcing an engineering system into
Reliability_engineering
concerned with the availability of the assets. The assets are either services or resources offered to users. Check-pointed system pattern describes a
Security_pattern
When a computer program fails to release unnecessary memory
excessive memory but does eventually release it. Because they can exhaust available system memory as an application runs, memory leaks are often the cause of
Memory_leak
Algorithm used for program correctness
currently holding ("ALLOCATED") How much of each resource the system currently has available ("AVAILABLE") Resources may be allocated to a process only if the
Banker's_algorithm
Checking expected operations of a website
response time and availability (or uptime), but consistency and reliability metrics are gaining popularity. Measuring a website's availability and reliability
Website_monitoring
Maintaining or reestablishing vital information technology infrastructure
and real-time processing. Availability of IT systems became more important. Regulatory agencies became involved; availability objectives of 2, 3, 4 or
IT_disaster_recovery
Computer operating system
Windows is a proprietary operating system developed by Microsoft. Windows is grouped into families that cater to particular sectors of the computing industry
Microsoft_Windows
Duplication of critical components to increase reliability of a system
calculate availability of the overall system: Availability of redundant components = 1 - (1 - availability of component A) X (1 - availability of component
Redundancy_(engineering)
Modern form of the metric system
is the modern form of the metric system and the world's most widely used system of measurement. It is the only system of measurement with official status
International_System_of_Units
Computer-based technologies
technology system (IT system) is generally an information system, a communications system, or, more specifically speaking, a computer system — including
Information_technology
Open-source server virtualization platform
the Proxmox Cluster File System (pmxcfs), a FUSE-based distributed configuration database. The integrated high-availability manager can monitor configured
Proxmox_Virtual_Environment
Pricing system used in India for unscheduled electric power transactions
was discontinued after implementing for a few weeks. What is availability? Availability, for the purpose of the ABT order means the readiness of the generating
Availability-based_tariff
loss-adjusted food availability data. United States Department of Agriculture Tech. Bull. TB-1927. 123 pp. Food availability (per capita) data system. (Excel files)
List of countries by meat consumption
List_of_countries_by_meat_consumption
File holding settings for a computer program
that stores data used to configure a software system such as an application, a server or an operating system. Some applications provide a tool to create
Configuration_file
ISO standard unique string identifier for a digital object
Standardization (ISO). DOIs are an implementation of the Handle System; they also fit within the URI system (Uniform Resource Identifier). They are widely used to
Digital_object_identifier
System to identify resources on a network
The Domain Name System (DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources
Domain_Name_System
The Average Service Availability Index (ASAI) is a reliability index commonly used by electric power utilities. ASAI is calculated as ASAI = ∑ N i × 8760
Average Service Availability Index
Average_Service_Availability_Index
Computer operating system
Software Inc. (VSI). OpenVMS offers high availability through clustering—the ability to distribute the system over multiple physical machines. This allows
OpenVMS
Form of resilience with independent backup components
Redundancy is a form of resilience that ensures system availability in the event of component failure. Components (N) have at least one independent backup
N+1_redundancy
Feature of the Global Positioning System
A Selective Availability Anti-spoofing Module (SAASM) is used by military Global Positioning System receivers to allow decryption of precision GPS observations
Selective availability anti-spoofing module
Selective_availability_anti-spoofing_module
Text used for user authentication to prove identity
to discover using any of the available automatic attack schemes. Nowadays, it is a common practice for computer systems to hide passwords as they are
Password
Component whose failure will disrupt the entire system
that would enable the system to continue to function without it. SPOFs are undesirable in any system with a goal of high availability or reliability, be
Single_point_of_failure
1994 video game
System Shock is a 1994 first-person action-adventure video game developed by LookingGlass Technologies and published by Origin Systems. It was directed
System_Shock
Software for, carrier-grade, hardware management
abstracted system event log, hardware events/alarms, and a managed hot-swap interface. It aims for service availability beyond high availability (HA) expectations
OpenHPI (Service Availability)
OpenHPI_(Service_Availability)
Cluster of IBM mainframes
to 32 systems to share a workload for high performance and high availability. In 1990, IBM mainframe computers introduced the concept of a Systems Complex
IBM_Parallel_Sysplex
Rewriting system and type of formal grammar
An L-system or Lindenmayer system is a parallel rewriting system and a type of formal grammar. An L-system consists of an alphabet of symbols that can
L-system
Open specification
high-availability computer systems using open architecture technology. This group published a white paper, “Providing Open Architecture High Availability Solutions”
Hardware_Platform_Interface
Linux distribution based on Red Hat Enterprise Linux
2025. "General Availability of AlmaLinux OS 9.7 Stable!". almalinux.org. 17 November 2025. Retrieved 17 November 2025. "General Availability of AlmaLinux
AlmaLinux
System for rating game players
Bradley–Terry model. The Elo system was invented as an improved chess rating system over the previously used Harkness rating system and has since been adapted
Elo_rating_system
2011 book by Daniel Kahneman
of examples. The availability heuristic operates on the notion that, "if you can think of it, it must be important". The availability of consequences associated
Thinking,_Fast_and_Slow
File system
software under the GPL-2.0-only license. AdvFS has been used in high-availability systems where fast recovery from downtime is essential. AdvFS uses a relatively
AdvFS
Software for managing digital content
architecture Availability of plug-ins for additional functionalities. Security precautions such as 2 Factor Authentication Digital asset management systems are
Content_management_system
Indian railway safety technology
HBL Power Systems, and Kernex Microsystems. As per the Ministry of Railways, it is one of the cheapest train protection systems available worldwide.
Kavach (train protection system)
Kavach_(train_protection_system)
Brazilian instant payment platform
payments – Enhancing the speed and availability of retail payments" on the benefits and design of instant payment systems. The Central Bank's technical team
Pix_(payment_system)
Software that manages separately different parts of display screens
In computing, a windowing system (or window system) is a software suite that manages separately different parts of display screens. It is a type of graphical
Windowing_system
Data storage technology
Retrieved September 29, 2017. Gray, Jim (Oct 1990). "A census of Tandem system availability between 1985 and 1990" (PDF). IEEE Transactions on Reliability. 39
RAID
Operating system
multi-user, real-time operating system released by Whitesmiths, of Westford, Massachusetts. The product was commercially available from 1979 through 1988. Idris
Idris_(operating_system)
History of Apple's current Mac operating system
operating system (formerly named Mac OS X until 2011 and then OS X until 2016), began with the company's project to replace its classic Mac OS. That system, up
MacOS_version_history
Voting system that makes outcomes proportional to vote totals
Proportional representation (PR) is achieved by any electoral system under which subgroups of an electorate are reflected proportionately in the elected
Proportional_representation
Computerized systems used to track and document the manufacturing process
execute production orders with resources of the right capabilities and availability. Scheduling (production processes). These activities determine the production
Manufacturing execution system
Manufacturing_execution_system
Windowing system for bitmap displays on UNIX-like systems
Server, available as free and open-source software under the MIT License and similar permissive licenses. X is an architecture-independent system for remote
X_Window_System
US Space Force communications satellite system
and improved operational availability. The MUOS was declared fully operational for use in 2019. The Mobile User Objective System (MUOS), through a constellation
Mobile_User_Objective_System
High-availability cluster software
(rebranded as Veritas Infoscale Availability and also known as VCS and also sold bundled in the SFHA product) is high-availability cluster software for Unix
Veritas_Cluster_Server
Part-time / on-call / reserve firefighters in Ireland and the United Kingdom
the lack of development opportunities and the often inflexible availability system.' As well as responding to emergency calls and undertaking community
Retained_firefighter
Windows Server System software
A standalone version for small and medium business customers is available. System Center Virtual Machine Manager enables increased physical server utilization
System Center Virtual Machine Manager
System_Center_Virtual_Machine_Manager
travel, tourism, insurance
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travel, tourism, insurance