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Design concept
Active redundancy is a design concept that increases operational availability and that reduces operating cost by automating most critical maintenance
Active_redundancy
Duplication of critical components to increase reliability of a system
away from flood plain areas. The two functions of redundancy are passive redundancy and active redundancy. Both functions prevent performance decline from
Redundancy_(engineering)
Systems with high up-time, a.k.a. "always on"
99.9023% availability. Two kinds of redundancy are passive redundancy and active redundancy. Passive redundancy is used to achieve high availability
High_availability
Computer networking protocol allowing first hop fallback on router failure
First hop redundancy protocols (FHRP) are a category of networking protocols designed to protect the default gateway used on a subnetwork by allowing two
First-hop_redundancy_protocol
Form of resilience with independent backup components
also possible to have N+1 redundancy with active-active components, in such cases the backup component will remain active in the operation even if all
N+1_redundancy
Maintaining a device in working condition
that incorporate active redundancy and fault reporting. It is also applicable to non-mission-critical systems that lack redundancy and fault reporting
Maintenance
Inter-router protocol that automatically assigns routers to hosts
The Virtual Router Redundancy Protocol (VRRP) is a computer networking protocol that provides for automatic assignment of available Internet Protocol (IP)
Virtual Router Redundancy Protocol
Virtual_Router_Redundancy_Protocol
Maintenance concept
operation That is a prerequisite for condition-based maintenance. Active redundancy can be integrated with fault reporting to reduce the down time to
Fault_reporting
Directory service, created by Microsoft for Windows domain networks
controllers for redundancy". TechNet. Microsoft. Retrieved 5 February 2014. Posey, Brien (23 August 2010). "10 tips for effective Active Directory design"
Active_Directory
Subset of an IT infrastructure system that shares no service-critical components
Services, Microsoft Azure and Google Cloud. Single point of failure Active redundancy "What are Azure regions and availability zones?". learn.microsoft
Availability_zone
Defined levels of resiliency and redundancy for IT infrastructure
Data center tiers are defined levels of resiliency and redundancy for IT facility infrastructure. They are widely used in the data center, ISP and cloud
Data_center_tiers
Probability a system works when required
secondary failures. This is called active redundancy, which requires no maintenance to prevent mission failure. Active redundancy is required for systems that
Availability_(system)
Overview of computer engineering topics
multithreading Dependability Active redundancy Dual modular redundancy Triple modular redundancy High-availability Seamless Redundancy N-version programming
Computer engineering compendium
Computer_engineering_compendium
Network protocol for Ethernet that provides seamless failover
High-availability Seamless Redundancy (HSR) is a network protocol for Ethernet that provides seamless failover against failure of any single network component
High-availability Seamless Redundancy
High-availability_Seamless_Redundancy
Measurement of the actual versus predicted uptime of a system
A_{o}=A_{o}^{D}\times A_{o}^{FI}\times A_{o}^{L}\times A_{o}^{C}} Active redundancy Availability Downtime Reliability block diagram "Opnav Instruction
Operational_availability
32-bit military computer
and non-U.S. forces. The historic AN/UYK-43 architecture includes active redundancy. It includes multiple processors, multiple memory banks, and multiple
AN/UYK-43
Network system for establishing a fault-tolerant default gateway
networking, the Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol for establishing a fault-tolerant default gateway. Version 1
Hot_Standby_Router_Protocol
protocol that attempts to overcome the limitations of existing first hop redundancy protocols by adding basic load balancing functionality. In addition to
Gateway Load Balancing Protocol
Gateway_Load_Balancing_Protocol
Hypothesis in neuroscience
density). This relates free energy minimization to the principle of minimum redundancy. Free energy minimisation provides a useful way to formulate normative
Free_energy_principle
Software to manage services on a server-cluster
via a configuration object. Services can use ‘No Redundancy’, 2N, N+M, N-way, and N-way Active redundancy models. OpenSAF lacks obvious modeling toolchains
OpenSAF
Gene or genetic redundancy is a term used to describe the existence of multiple genes in the genome of an organism that perform the same biochemical function
Gene_redundancy
simplest configuration (or “redundancy model”) is 1 active, 1 standby, or 1+1. Another common configuration is N+1 (N active, 1 standby), which reduces
High_availability_software
English broadcaster and natural historian (born 1926)
Hierarchy of hazard controls Incident pit Lockout–tagout Permit To Work Redundancy Safety data sheet Situation awareness Diving team Bellman Chamber operator
David_Attenborough
Acoustic sensing method
technology: passive sonar means listening for the sound made by vessels; active sonar means emitting pulses of sounds and listening for echoes. Sonar may
Sonar
Fault-tolerant computer system
that run the same set of operations at the same time in parallel. The redundancy (duplication) allows error detection and error correction: the output
Lockstep_(computing)
American technology business journalist (born 1962)
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Kara_Swisher
Computer network protocol
increased by adding redundancy for critical elements. A distinction can be made between system and media redundancy. System redundancy can also be implemented
Profinet
Distinction between meanings of Euclidean space transformations
active transformations can be characterized as transformations of physical space, while passive transformations are characterized as redundancies in
Active and passive transformation
Active_and_passive_transformation
Land service branch of the U.S. military
forces and to question the number of divisions and brigades as well as the redundancy of maintaining two reserve components, the Army National Guard and the
United_States_Army
Active protection system
multiple effectors and sensors distributed over the vehicle's surface. The redundancy of sensors and effectors ensures that every area is protected against
AMAP-ADS
Intelligence of machines
matter of hours. Economists have frequently highlighted the risks of redundancies from AI, and speculated about unemployment if there is no adequate social
Artificial_intelligence
Artificial intelligence field of study
Researchers in safety-critical AI have proposed using architectural redundancy and design diversity to reduce the risk that a single faulty, compromised
AI_safety
In ecology, functional equivalence (or functional redundancy) is the ecological phenomenon that multiple species representing a variety of taxonomic groups
Functional equivalence (ecology)
Functional_equivalence_(ecology)
Term in reliability engineering
Maintenance concepts Redundancy Common cause failure Diagnostics Level of repair Repair status Dormant failures Test coverage Active operational times,
Availability
Increase in blood flow to certain tissues in the body
arteriolar vasodilatation via KIR and Na+/K+ATPase: implications for redundancy in active hyperaemia". Journal of Physiology. 593 (23): 5111–5126. doi:10.1113/JP270613
Hyperaemia
Electrical device that uses batteries to prevent any interruption of power flow
2016-03-03. Detailed explanation of UPS redundancy options"High-Availability Power Systems, Part II: Redundancy Options" (PDF). Archived from the original
Uninterruptible_power_supply
Concept to reduce computer security risks
intrusion is not quarantined. Information redundancy is a strategy performing security measures to keep redundancy for information and using it in case of
Defense_strategy_(computing)
Model used in risk analysis
human error Mitigation Proximate and ultimate causation Proximate cause Redundancy (engineering) Root cause analysis System accident Systems engineering
Swiss_cheese_model
Association football club in England
23 December 2020. "Gunnersaurus: Arsenal mascot returns to club after redundancies". BBC Sport. 10 November 2020. Archived from the original on 10 November
Arsenal_F.C.
Technology for computer networking
Lobe Attachment Module. The CAUs supported features such as Dual-Ring Redundancy for alternate routing in the event of a dead port, modular concentration
Token_Ring
Study of human body movement
could achieve that task. This redundancy appears at multiple levels in the chain of motor execution: Kinematic redundancy means that for a desired location
Kinesiology
1877 steam hammer in Le Creusot, France
legs, the steam cylinder and its valves and linkages, and finally, the active mass itself — the piston, piston rod, hammerhead and die. The anvil weighed
Creusot_steam_hammer
Attempt to send messages to intelligent extraterrestrials
decode. In METI research, any message must have some redundancy, although the exact amount of redundancy and message formats are still in great dispute. Using
Active_SETI
Computer network technique
either an Ethernet device that has more than one network interface, for redundancy purposes, or in firewall technology, one of the firewall architectures
Dual-homed
Compact encoding of digital data
Lossless compression reduces bits by identifying and eliminating statistical redundancy. No information is lost in lossless compression. Lossy compression reduces
Data_compression
Future frigate of the Royal Navy
DefStan 02-900. This redesign delivers enhanced survivability, system redundancy, and resilience compared to older Royal Navy escort ships like the Type
Type_31_frigate
Automatic ship station- and heading-holding systems
has no redundancy. Loss of position may occur in the event of a single fault. Equipment Class 2 has redundancy so that no single fault in an active system
Dynamic_positioning
Unique numeric book identifier since 1970
their length to be determined, as follows: A check digit is a form of redundancy check used for error detection, the decimal equivalent of a binary check
ISBN
British video game developer
during 1986, Timex enacted layoffs in Dundee. Jones accepted a voluntary redundancy for £3,000, a roughly half-year salary that he invested into an Amiga
Rockstar_North
Australian journalist
Education Our Lady of Mercy College Deakin University University of Melbourne Occupation Journalist Years active 1987−present Known for Lateline Children 3
Emma_Alberici
Electronic flight control system
wire system. This system also included solid-state components and system redundancy, was designed to be integrated with a computerised navigation and automatic
Fly-by-wire
First commercial jet airliner, four-engined
system; these systems had operational redundancy in that they could keep working even if only a single engine was active. The majority of hydraulic components
De_Havilland_Comet
Approach to business improvement
Management, in this context, highlights the obligation of executives to actively oversee quality through adequate funding, training, staffing, and goal
Total_quality_management
Multi-national four-engine turboprop military transport aircraft
of electrically/hydraulically powered hybrid actuators. The dissimilar redundancy provides more protection against battle damage. In June 2019, Airbus Defence
Airbus_A400M_Atlas
Australian conservationist (1962–2006)
Hierarchy of hazard controls Incident pit Lockout–tagout Permit To Work Redundancy Safety data sheet Situation awareness Diving team Bellman Chamber operator
Steve_Irwin
CEO Hakan Abrak. Management sent 300 employees notices of potential redundancies in July 2025, and by October 2025, between 250 and 300 of the BARB staff
List of video games notable for negative reception
List_of_video_games_notable_for_negative_reception
Former suspension bridge (stood 1928–1967)
eyebars per link. The eyebars in the Silver Bridge offered little to no redundancy, as each chain link consisted of just two eyebars in parallel. (Each bar
Silver_Bridge
only be dismissed for a fair reason. Employees are also entitled to a redundancy payment if their job was no longer economically necessary. If an enterprise
United_Kingdom_labour_law
Type of Soviet nuclear power reactor
the RBMK design was optimized for speed of production but sacrificed redundancy. Several of its design characteristics would prove to be dangerously unstable
RBMK
German filmmaker (1902–2003)
Hierarchy of hazard controls Incident pit Lockout–tagout Permit To Work Redundancy Safety data sheet Situation awareness Diving team Bellman Chamber operator
Leni_Riefenstahl
Conditions in which the temperature of a diver can remain stable
internally by metabolic processes and may be supplied from external sources by active heating of the body surface or the breathing gas. Radiation heat loss is
Thermal balance of the underwater diver
Thermal_balance_of_the_underwater_diver
British public service broadcaster
Centre. The plans included a reduction in posts of 2,500; including 1,800 redundancies, consolidating news operations, reducing programming output by 10% and
BBC
Reconnaissance assets of Marine Air-Ground Task Force
formed in 1966. In July 1974, Force Reconnaissance was downsized to one active duty company. As a result, in March 1975 both 1st and 3rd Reconnaissance
United States Marine Corps Reconnaissance Battalions
United_States_Marine_Corps_Reconnaissance_Battalions
Species of flowering plant in the nightshade family
instances of attacks. To compensate, they have a large initial size for redundancy. These leaves also have a greater longevity and ability to metabolize
Datura_stramonium
Change in the heritable traits of populations
process is easier once a gene has been duplicated because it increases the redundancy of the system; one gene in the pair can acquire a new function while the
Evolution
Part of the female reproductive tract
Vaginal changes that happen with aging and childbirth include mucosal redundancy, rounding of the posterior aspect of the vagina with shortening of the
Vagina
Type of computer memory
architecture, and area efficiency is an active area of research. The first DRAM integrated circuits did not have any redundancy. An integrated circuit with a defective
Dynamic_random-access_memory
Carrier-based multi-role fighter aircraft family
Positioning System later was integrated to provide more precise navigation and redundancy in case either system failed. The chaff/flare dispensers are located on
Grumman_F-14_Tomcat
Scottish radio presenter
along with colleagues Jane Lewis and Sarah Heaney had accepted voluntary redundancy from STV. Nanjiani left Scotland Today and STV on 5 May 2006. In interviews
Shereen_Nanjiani
Danish video game company
Retrieved 10 June 2018. Scammell, David (25 June 2013). "IO Interactive redundancies affect 'around 70'". VideoGamer.com. Archived from the original on 12
IO_Interactive
Political scandals over anomalous flood control project
of flood control projects included in the 2025 national budget, citing redundancy and improper project placement. ACT Teachers Party-list Representative
Flood control projects scandal in the Philippines
Flood_control_projects_scandal_in_the_Philippines
British businessman (1948 – 2010)
Lofthouse. He lost his job in the wave of redundancies that followed the 1980s miners' strike; he spent his redundancy money on renting a workshop, and initially
Jimi_Heselden
Modular space station in low Earth orbit
Part of the ROS atmosphere control system is the oxygen supply. Triple-redundancy is provided by the Elektron unit, solid fuel generators, and stored oxygen
International_Space_Station
Group of computers that run with minimum downtime
electronic commerce websites. HA cluster implementations attempt to build redundancy into a cluster to eliminate single points of failure, including multiple
High-availability_cluster
King of France from 1643 to 1715
October 1685, Louis issued the Edict of Fontainebleau, which cited the redundancy of privileges for Protestants given their scarcity after the extensive
Louis_XIV
Bridge over the Thames in London, England
cylinders. The reason for two pairs of engines on each pier was to build in redundancy. The machinery was "equal to twice the requirements of the Board of Trade"
Tower_Bridge
Mathematical transform that expresses a function of time as a function of frequency
{f}}(-\xi )={\widehat {f}}^{*}(\xi )} (see § Conjugation below). This redundancy enables Eq.2 to distinguish f ( x ) = cos ( 2 π ξ 0 x ) {\displaystyle
Fourier_transform
insight to the overall function and stability of an ecosystem. Functional redundancy refers to the phenomenon that species in the same ecosystem fill similar
Functional_group_(ecology)
2012 Microsoft operating system version
sized hard disks into virtual drives and specify mirroring, parity, or no redundancy on a folder-by-folder basis. For easier management of files and folders
Windows_8
Disorder caused by dissolved gases forming bubbles in tissues
Hierarchy of hazard controls Incident pit Lockout–tagout Permit To Work Redundancy Safety data sheet Situation awareness Diving team Bellman Chamber operator
Decompression_sickness
Species of great ape
just as bonobos could not replace elephants. There is little functional redundancy between frugivorous mammals of the Congo, which face severe human hunting
Bonobo
Gaff-rigged ketch
supplying fresh fruit to the townspeople. During the Great War she took an active part ferrying munitions across the Irish Sea. In 1961 the vessel fell out
Garlandstone
Chinese artificial intelligence company
Experts Parallelism (EP), Fully Sharded Data Parallel (FSDP) and Zero Redundancy Optimizer (ZeRO). It is similar to PyTorch DDP, which uses NCCL on the
DeepSeek
111 IPX-in-IP IPX in IP 0x70 112 VRRP Virtual Router Redundancy Protocol, Common Address Redundancy Protocol (not IANA assigned) RFC 5798 0x71 113 PGM PGM
List_of_IP_protocol_numbers
Free and open-source Unix-like operating system
OpenBSD) and IPFilter. As of FreeBSD 5.4, support for the Common Address Redundancy Protocol (CARP) was imported from OpenBSD, allowing several nodes to share
FreeBSD
Non-profit digital library
increasingly outdated technology and that network distribution could eliminate redundancy and increase accessibility (for example, all Princeton's administrative
JSTOR
Global system of connected computer networks
upstream provider for connectivity, or implement multihoming to achieve redundancy and load balancing. Internet exchange points are major traffic exchanges
Internet
NASA rover exploring Mars since 2012
Communications: Curiosity is equipped with significant telecommunication redundancy by several means: an X band transmitter and receiver that can communicate
Curiosity_(rover)
Thermal power station where the heat source is a nuclear reactor
nuclear stations require at least two distinct sources of offsite power for redundancy. These are usually provided by multiple transformers that are sufficiently
Nuclear_power_plant
Storage of digital data readable by computers
algorithms. The cyclic redundancy check (CRC) method is typically used in communications and storage for error detection. Redundancy solutions include storage
Computer_data_storage
Networking protocol for clock synchronization
typically 4. Mode: 3 bits Association mode: 0 = reserved 1 = symmetric active 2 = symmetric passive 3 = client 4 = server 5 = broadcast 6 = control 7
Network_Time_Protocol
Israeli long range BMD radar
SPECTRA. TERRA's performance is achieved through automatic handover and redundancy between the ULTRA and SPECTRA radars, combined with improved target load
EL/M-2090
American stealth air superiority fighter
stand-by flight instrumentation group and fuel quantity indicator for redundancy. The stand-by flight group displays an artificial horizon, for basic instrument
Lockheed_Martin_F-22_Raptor
Principle in biology
The redundancy principle in biology expresses the need of many copies of the same entity (cells, molecules, ions) to fulfill a biological function. Examples
Redundancy principle (biology)
Redundancy_principle_(biology)
American long-range air-to-air missile
track low‑altitude targets when ship‑mounted was also noted in tests. Redundancy was also noted, with contemporary fleet defense being provided predominantly
AIM-54_Phoenix
King of Babylon from 605 to 562 BC
Biblical Literature. ISBN 978-1589835566. Ayali-Darshan, Noga (2012). "A Redundancy in Nebuchadnezzar 15 and Its Literary Historical Significance". JANES
Nebuchadnezzar_II
Vacuum tube used to display images
capacitor (Retrace Timing Capacitor) or series of capacitors (to provide redundancy) is used to slow the collapse of the magnetic field. The design of the
Cathode_ray_tube
Church in Norfolk, England
Glazier John Wighton was a resident in the parish, and his workshop remained active in the parish for multiple decades following his death. Parishioner Helen
St_Mary_Coslany
Part of IEC 62439-3 standard
protocol (PRP "Parallel Redundancy Protocol" or HSR "High-availability Seamless Redundancy") Several master clocks can be active at the same time; the slave
Precision Time Protocol Industry Profile
Precision_Time_Protocol_Industry_Profile
Hypothesized risk to human existence
than biological neurons, enabling higher precision and requiring less redundancy. Duplicability: unlike human brains, AI software and models can be easily
Existential risk from artificial intelligence
Existential_risk_from_artificial_intelligence
ACTIVE REDUNDANCY
ACTIVE REDUNDANCY
Girl/Female
Greek
Active.
Surname or Lastname
English
English : habitational name from any of various places, for example in Shropshire and Cheshire, named Clive, from the dative case of Old English clif ‘slope’, ‘bank’, ‘cliff’ (see Cliff), originally used after a preposition. In some cases the name may be topographical, with the same origin and meaning.
Girl/Female
German
Active.
Boy/Male
Teutonic American English
Active.
Boy/Male
Indian
Active
Girl/Female
Hindi
Active.
Boy/Male
English
Active.
Boy/Male
English
Active.
Boy/Male
French American
Born eighth.
Boy/Male
Muslim
Active
Girl/Female
Greek
Active.
Boy/Male
British, English, Indian, Russian
Work
Boy/Male
Polish
Active.
Male
English
English pet form of Celtic Arthur, possibly ARTIE means "bear-man."Â
Boy/Male
English
Active.
Girl/Female
German
Active.
Male
English
Pet form of English Ace, ACIE means "number one."
Girl/Female
Slavic
Active.
Male
English
English surname transferred to forename use, from the name of various places, derived from Old English clif, CLIVE means "bank, cliff, slope."
Girl/Female
German
Active.
ACTIVE REDUNDANCY
ACTIVE REDUNDANCY
Boy/Male
Arabic, Muslim
Free from the Hell; Free
Boy/Male
Tamil
A jewel, One who prevents
Girl/Female
Indian
One who is worshipped
Girl/Female
French American Scottish
God is gracious.
Boy/Male
English
Fighting boar.
Surname or Lastname
English
English : habitational name from Hartfield in East Sussex, originally named with Old English heorot ‘stag’, ‘hart’ + feld ‘open country’.Americanized form of German and Jewish Herzfeld.
Boy/Male
Hindu
Baby Krishna, Infant Krishna
Girl/Female
English
Based on the initials J. C. or an abbreviation of Jacinda.
Boy/Male
Hebrew Biblical
God will develop.
Girl/Female
British, English
Bright Fame
ACTIVE REDUNDANCY
ACTIVE REDUNDANCY
ACTIVE REDUNDANCY
ACTIVE REDUNDANCY
ACTIVE REDUNDANCY
adv.
In an active manner; nimbly; briskly; energetically; also, by one's own action; voluntarily, not passively.
a.
In action; actually proceeding; working; in force; -- opposed to quiescent, dormant, or extinct; as, active laws; active hostilities; an active volcano.
a.
Requiring or implying action or exertion; -- opposed to sedentary or to tranquil; as, active employment or service; active scenes.
n.
Any one of the active processes going on in an organism; the performance of a function; as, the action of the heart, the muscles, or the gastric juice.
v. t.
To make active.
a.
Applied to all verbs that express action as distinct from mere existence or state.
a.
Doing; active.
a.
Not active; having no power to move; that does not or can not produce results; inert; as, matter is, of itself, inactive.
n.
Action.
a.
Not disposed to action or effort; not diligent or industrious; not busy; idle; as, an inactive officer.
a.
Given to action rather than contemplation; practical; operative; -- opposed to speculative or theoretical; as, an active rather than a speculative statesman.
a.
Given to action; constantly engaged in action; energetic; diligent; busy; -- opposed to dull, sluggish, indolent, or inert; as, an active man of business; active mind; active zeal.
a.
Quick in physical movement; of an agile and vigorous body; nimble; as, an active child or animal.
adv.
In an active signification; as, a word used actively.
a.
Having the power or quality of acting; causing change; communicating action or motion; acting; -- opposed to passive, that receives; as, certain active principles; the powers of the mind.
a.
Brisk; lively; as, an active demand for corn.
a.
Applied to a form of the verb; -- opposed to passive. See Active voice, under Voice.
a.
Acting in concurrence; united in action.
a.
Implying or producing rapid action; as, an active disease; an active remedy.
a.
Not active; inert; esp., not exhibiting any action or activity on polarized light; optically neutral; -- said of isomeric forms of certain substances, in distinction from other forms which are optically active; as, racemic acid is an inactive tartaric acid.