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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
Term in reliability engineering
Normally high availability systems might be specified as 99.98%, 99.999% or 99.9996%. The converse, unavailability, is 1 minus the availability. The simplest
Availability
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
Group of computers that run with minimum downtime
In computing, high-availability clusters (HA clusters) or fail-over clusters are groups of computers that support server applications that can be reliably
High-availability_cluster
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
High_availability_software
SQL database engine software
December 2009. "MySQL :: MySQL Enterprise High Availability". www.mysql.com. Retrieved 9 March 2019. "High Availability & Performance Tuning". MariaDB KnowledgeBase
MySQL
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
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
Acronym for a common web hosting solution
database (master) and its copies (slaves). Such high-availability setups may also improve the availability of LAMP instances by providing various forms of
LAMP_(software_bundle)
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
Open-source server virtualization platform
Management is available through a web interface, command-line tools and a REST API. The platform integrates clustering, high availability, software-defined
Proxmox_Virtual_Environment
Consistency model used in distributed computing to achieve high availability
consistency is a consistency model used in distributed computing to achieve high availability. An eventually consistent system ensures that if no new updates are
Eventual_consistency
Java-based HTTP web server environment
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
Apache_Tomcat
Proprietary database management system
General Availability of AI Vector Search in Oracle Database 23ai". Oracle Corporation. Retrieved 2 May 2024. "Oracle Announces General Availability of JSON
Oracle_Database
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
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
Defined levels of resiliency and redundancy for IT infrastructure
computing industries as a framework for designing and classifying high availability systems. The tier classification system was created by the Uptime
Data_center_tiers
reputation. The terms high availability, continuous operation, and continuous availability are generally used to express how available a system is. The following
Continuous_availability
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
Maintenance_window
Concept in computing
in both name spaces referring to different computer IP addresses. High-availability clusters (HA clusters) usually use a heartbeat private network connection
Split-brain_(computing)
Engineering characterization of a product or system
points High availability Risk assessment Reliability-centered maintenance Safety instrumented system Safety integrity level Reliability, availability and
Reliability, availability, maintainability and safety
Reliability,_availability,_maintainability_and_safety
Software architecture design method
In information technology, high-availability application architecture is a process followed when implementing a new application into an existing business-wide
High-availability application architecture
High-availability_application_architecture
Facility used to house computer servers
centers. Various metrics exist to measure the data-availability that results from data-center availability beyond 95% uptime, with the top of the scale counting
Data_center
Logical volume management system
HA-LVM Cluster-awareness is left to the application providing the high availability function. For the LVM's part, HA-LVM can use CLVM as a locking mechanism
Logical Volume Manager (Linux)
Logical_Volume_Manager_(Linux)
Communication platform for organizations
large organizations designed specifically to handle high volumes of traffic within a high-availability environment. Currently supported communication channels
MessagePlus/Open
AT&T/Bell family of computers
AT&T UNIX operating system and were named after the successful 3B20D High Availability processor. In 1984, after regulatory constraints were lifted, AT&T
3B_series_computers
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
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)
High-availability cluster software
websites. High-availability clusters (HAC) improve application availability by failing or switching them over in a group of systems—as opposed to high-performance
Veritas_Cluster_Server
Calendaring and mail server
for Exchange Server 2007. This service pack includes an additional high-availability feature called SCR (Standby Continuous Replication). Unlike CCR, which
Microsoft_Exchange_Server
American information technology company
explicitly for mission-critical production environments, EOS delivers high availability through its design: Hitless Software Patches: Operators can apply
Arista_Networks
Data management company
2021; 5 years ago (2021-08-23) Operating system Windows, Linux, Unix, Mac Available in 10 languages List of languages English, Chinese (Simplified), Chinese
Arcserve
Set of computers configured in a distributed computing system
availability over that of a single computer, while typically being much more cost-effective than single computers of comparable speed or availability
Computer_cluster
Free and open-source proxy software
HAProxy is a free and open source software that provides a high availability load balancer and proxy (forward proxy, reverse proxy) for TCP and HTTP-based
HAProxy
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
Open-source DHCP server
Environment (PXE) boot, client classification, shared networks, and high-availability (failover pairs). Kea can store leases locally in a memfile, or in
Kea_(software)
Topics referred to by the same term
commonly taken to mean "99.999%", may refer to: High availability of services, when a service is available for 99.999% of the time, or around 5 minutes of
Five_nines
Use of software engineering practices for IT
Chaos engineering Cloud computing Data center Disaster recovery High availability software Infrastructure as code Operations, administration and management
Site_reliability_engineering
High-availability cluster software
IBM's solution for high-availability clusters on the AIX Unix and Linux for IBM System p platforms and stands for High Availability Cluster Multiprocessing
IBM High Availability Cluster Multiprocessing
IBM_High_Availability_Cluster_Multiprocessing
off-the-shelf (COTS) technology. Service availability is an extension of high availability, referring to services that are available regardless of hardware, software
Service_Availability_Forum
Cluster of IBM mainframes
allow a cluster of up to 32 systems to share a workload for high performance and high availability. In 1990, IBM mainframe computers introduced the concept
IBM_Parallel_Sysplex
Component whose failure will disrupt the entire system
function without it. SPOFs are undesirable in any system with a goal of high availability or reliability, be it a business practice, software application, or
Single_point_of_failure
Distributed replicated storage system for Linux
applications, and some shell scripts. DRBD is traditionally used in high availability (HA) computer clusters, but beginning with DRBD version 9, it can
DRBD
Free software high-availability clustering solution
The Linux-HA (High-Availability Linux) project provides a high-availability (clustering) solution for Linux, FreeBSD, OpenBSD, Solaris and Mac OS X which
Linux-HA
High-availability cluster software
HP Serviceguard, formerly known as MC/ServiceGuard, is a high-availability cluster software produced by HP that runs on HP-UX and Linux. Serviceguard
HP_Serviceguard
Internet ecosystem layer that addresses bottlenecks
network of proxy servers and corresponding data centers. CDNs provide high availability and performance by distributing content geographically closer to end
Content_delivery_network
Design for Availability is the design process for a system targeting availability of the system for guarantying readiness as the major part of goal specification
Design_for_availability
Synchronization primitive for fault tolerance
of the common techniques in mission critical systems for providing high availability and fault tolerance of network services by detecting the network or
Heartbeat_(computing)
Relational database management system
in-memory, relational database management system with persistence and high availability. Originally designed and implemented at Hewlett-Packard labs in Palo
TimesTen
System for grading the railway network of Great Britain
route availability for a line is calculated by taking into account bridge strength, track condition, structural issues and so on. A route availability of
Route_availability
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
On-demand cloud computing provider
at their disposal a virtual cluster of computers, with extremely high availability, which can be interacted with over the Internet via REST APIs, a CLI
Amazon_Web_Services
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
Network protocol standard for Ethernet seamless failover
of IEC 61850. PRP and HSR are suited for applications that request high availability and short switchover time, such as: protection for electrical substation
Parallel_Redundancy_Protocol
High-availability cluster software
by Red Hat MRG. The High Availability Add-On is Red Hat's implementation of Linux-HA. It attempts to ensure service availability by monitoring other nodes
Red_Hat_Cluster_Suite
Free and open-source object relational database management system
"AlloyDB for PostgreSQL fast high-availability cloud database - Google Cloud Blog". March 6, 2025. "Announcing the general availability of AlloyDB Omni". Google
PostgreSQL
Computing with supercomputers and clusters
Quantum computing Metacomputing Grand Challenge High Productivity Computing Systems High-availability cluster High-throughput computing Many-task computing Supercomputing
High-performance_computing
Joint hierarchical database made by IBM
enhance availability and handle large data volumes effectively. IMS V9 introduced online reorganization for HALDBs, supporting continuous availability and
IBM Information Management System
IBM_Information_Management_System
communications service providers that is designed for scalability, high performance and high availability. On December 5, 2014, the Open Networking Lab (ON.Lab) along
ONOS
Automatic switching from failed computer system to standby computers
failover capability in servers, systems or networks requiring high availability and a high degree of reliability. At the server level, failover automation
Failover
Distributed data processing framework
and support for non-POSIX operations such as Append. In May 2012, high-availability capabilities were added to HDFS, letting the main metadata server
Apache_Hadoop
the original on 2015-01-18. Retrieved 2015-01-08. Redis Persistence high availability - Redis master/slave replication - single point of failure? - Stack
Comparison of structured storage software
Comparison_of_structured_storage_software
Defunct clustering system for Linux
directed to the least loaded node available. OpenSSI is designed to be used for both high performance and high availability clusters. It is possible to create
OpenSSI
Type of computing virtualization
explicit coupling with specific equipment, therefore availability is defined by the availability of VNF services. Because NFV technology can virtualize
Network function virtualization
Network_function_virtualization
Open source high availability resource manager software
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
Pacemaker_(software)
Corporation. It is claimed to be intended for systems that require high availability, high scalability and low latency, particularly in cases when traditional
Oracle_Coherence
Topics referred to by the same term
functions in mathematics Hallstatt culture, an archaeological culture High availability, systems design and implementation with a view to maximising service
Ha
Clustering standard in computing
Resource agents are currently supported by Linux-HA Heartbeat, the high-availability cluster software. "OpenCF Supporters". Archived from the original
Open_Cluster_Framework
Recorded state of a computer storage system at a particular point in time
for low-availability systems (on desktop computers and small workgroup servers, on which regular downtime is acceptable). High-availability 24/7 systems
Snapshot_(computer_storage)
Software for, carrier-grade, hardware management
and a managed hot-swap interface. It aims for service availability beyond high availability (HA) expectations. The OpenHPI project was conceived by
OpenHPI (Service Availability)
OpenHPI_(Service_Availability)
connections were load-balanced between the available cluster nodes. The NSC system was designed for high availability—all system services were either redundant
UnixWare_NonStop_Clusters
Computer network design model
ISBN 978-1-57870-084-4 High Availability Campus Network Design, Cisco, 2008, retrieved 2022-04-05 PDF Haviland, Geoff (1998). "Designing High-Performance Campus
Hierarchical internetworking model
Hierarchical_internetworking_model
Software to manage services on a server-cluster
one SC node or on multiple SC nodes, supporting high-availability clusters and service availability. The various components of the OpenSAF control plane
OpenSAF
Open specification
can provide continuous Service Availability. Additional features common in hardware platforms used for high-availability applications include online serviceability
Hardware_Platform_Interface
xCAT) Non-High-availability cluster Foreman oneSIS OpenHPC OpenSAF, founded by Motorola, from OpenSAF Foundation, implements Service Availability Forum Rocks
List of cluster management software
List_of_cluster_management_software
High-availability cluster software
after being acquired by SIOS Technology, Inc. High availability clusters (HAC) improve application availability by failing them over or switching them over
SIOS_LifeKeeper
High-availability clustering solution
TruCluster is a closed-source high-availability clustering solution for the Tru64 UNIX operating system. It was originally developed by Digital Equipment
TruCluster
Electrical device that uses batteries to prevent any interruption of power flow
ISBN 0-7803-7512-2, S2CID 195862090 Detailed explanation of UPS topologies "High-Availability Power Systems, Part I: UPS Internal Topology" (PDF). November 2000
Uninterruptible_power_supply
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
Telecommunications capability rating
(engineering) Carrier system High availability What's all the fuss about network resiliency? (link no longer available) Carrier Ethernet Ready for Prime
Carrier_grade
Relational database management system
architecture enables better resource utilization, scalability, and high availability by allowing multiple machines to process queries on a single database
CUBRID
Rechargeable battery type often used in motor vehicles
power supplies in telecommunications networks such as for cell sites, high-availability emergency power systems as used in hospitals, and stand-alone power
Lead–acid_battery
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
Cloud-based NoSQL database service
database service offered by Microsoft. It is designed to provide high availability, scalability, and low-latency access to data for modern applications
Cosmos_DB
Event metadata
a heartbeat network uses timestamping to monitor the nodes on a high availability computer cluster. Timestamping computer files (updating the timestamp
Timestamping_(computing)
Database running on a cloud computing platform
SQL or a NoSQL data model. Database services handle scalability and high availability, while making the underlying software stack transparent to users.
Cloud_database
Amount of useful work accomplished by a computer
benchmarks are available. Availability of a system is typically measured as a factor of its reliability. As reliability increases, so does availability (that is
Computer_performance
Future Internet architecture
Next-Generation Networks) is a Future Internet architecture that aims to offer high availability and efficient point-to-point packet delivery with network path selection
SCION_(Internet_architecture)
Computer firewall protocol
synchronise firewall states between machines running Packet Filter (PF) for high availability. It is used along with CARP to make sure a backup firewall has the
Pfsync
Data storage technology
data striping and redundant, online disks, it was common for high-capacity, high-availability data storage to rely on so-called SLEDs ("single, large, expensive
RAID
Storage operating system
Implementers often organize two storage systems in a high-availability cluster with a private high-speed link, either a Fibre Channel, InfiniBand, 10 Gigabit
ONTAP
Open-source container software
that can run both on a single node or on multiple nodes supporting high-availability clusters. The various components of the Kubernetes control plane are
Kubernetes
Fault recovery system for Ethernet
Cross-network Redundancy Protocol - CRP Beacon Redundancy Protocol - BRP High-availability Seamless Redundancy (HSR) With the settings specified in IEC 62439-2
Media_Redundancy_Protocol
Type of computer server
Domain controllers are typically deployed as a cluster to ensure high-availability and maximize reliability. In a Windows environment, one domain controller
Domain_controller
Computer operating system
developed and supported by VMS Software Inc. (VSI). OpenVMS offers high availability through clustering—the ability to distribute the system over multiple
OpenVMS
Duplication of critical components to increase reliability of a system
many others to provide geographic redundancy, high availability, fault tolerance and to ensure availability and reliability for their cloud services. As
Redundancy_(engineering)
Israeli computer scientist
asynchronous distributed systems, atomic broadcasting, high availability and high-availability clusters, and Byzantine fault tolerance. Dolev–Yao model
Danny_Dolev
Government of India Enterprise
Railway products include Single Section Digital Axle Counters (SSDAC), High Availability SSDAC (HA-SSDAC), Multi-section Digital Axle Counter (MSDAC) & Block
Central_Electronics_Limited
Database management system
embedded systems. The initial product was later joined by eXtremeDB High Availability (HA) for fault-tolerant applications. The eXtremeDB family now includes
Embedded_database
terminusdb/terminusdb-server, TerminusDB, 2020-05-19, retrieved 2020-05-19 Siwiec, J.E.: A High-Performance DB/DC System;IBM, G321-5051, 1978 "Stackshare Top In-Memory Databases"
List_of_in-memory_databases
travel, tourism, insurance
HIGH AVAILABILITY
HIGH AVAILABILITY
Surname or Lastname
English
English : from the Old French personal name Hu(gh)e, introduced to Britain by the Normans. This is in origin a short form of any of the various Germanic compound names with the first element hug ‘heart’, ‘mind’, ‘spirit’. Compare, for example, Howard 1, Hubble, and Hubert. It was a popular personal name among the Normans in England, partly due to the fame of St. Hugh of Lincoln (1140–1200), who was born in Burgundy and who established the first Carthusian monastery in England.In Ireland and Scotland this name has been widely used as an equivalent of Celtic Aodh ‘fire’, the source of many Irish surnames (see for example McCoy).
Boy/Male
Irish
Hugh is a translation of an ancient name Aodh meaning “â€fire.â€â€ A name with nationalistic connotations as Hugh O’Neill, Earl of Tyrone and Red Hugh O’Donnell, Earl of Tyrconnell together led a rebellion and won some major battles against the forces of the English queen Elizabeth 1st, before being defeated at the Battle of Kinsale in 1601.
Surname or Lastname
English
English : topographic name for someone who lived at the top of a hill or on a piece of raised ground, from Middle English heyt ‘summit’, ‘height’.
Boy/Male
Tamil
Praanshu | பà¯à®°à®¾à®‚à®·à¯
High
Praanshu | பà¯à®°à®¾à®‚à®·à¯
Boy/Male
Christian & English(British/American/Australian)
Fire
Girl/Female
Muslim
High
Surname or Lastname
English (chiefly East Anglia and northern England)
English (chiefly East Anglia and northern England) : nickname for a tall man, from Middle English hegh, hie ‘high’, ‘tall’, Old English hēah (compare Hay 2), or a topographic name for a dweller on a hilltop or high place, from the same word used in a topographical sense. This second use is supported by early forms such as Richard atte High (Sussex 1332).
Boy/Male
English
Son of Hugh.
Boy/Male
German
High.
Girl/Female
Muslim
High
Girl/Female
Muslim
High
Boy/Male
German
High.
Boy/Male
French Teutonic American Shakespearean English Welsh
Intelligent.
Girl/Female
Muslim
High
Boy/Male
Muslim
High
Surname or Lastname
English (chiefly Yorkshire)
English (chiefly Yorkshire) : topographic name for someone who lived by a hedged or fenced enclosure (Old English haga), or a habitational name from a place named with this word (or its Old Norse cognate hagi), especially three places called Haigh, two in West Yorkshire and the other near Manchester.
Boy/Male
American, Australian, British, Chinese, Christian, Danish, Dutch, English, French, German, Indian, Irish, Jamaican, Teutonic
Bright Mind; Bright in Mind and Spirit; Intelligent; Heart; Soul; Mind; Spirit
Boy/Male
Indian
High
Boy/Male
English
From the hillslope meadow.
Male
English
English form of Old French Hugues, HUGH means "heart," "mind," or "spirit."
HIGH AVAILABILITY
HIGH AVAILABILITY
HIGH AVAILABILITY
HIGH AVAILABILITY
HIGH AVAILABILITY
HIGH AVAILABILITY
HIGH AVAILABILITY
travel, tourism, insurance