redundancy
n. excessive plentifulness, superfluity; wordiness; state of being unemployed; layoff; abundance; needless repetition | ||||
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Redundancy definition was found in categories: Computer & Internet(3) Language, Idioms & Slang(3) Science & Technology(2) Arts & Humanities(1) Encyclopedia(1)
Redundancy Definition from Computer & Internet Dictionaries & Glossaries
| FOLDOC |
redundancy
1. <parallel> The provision of multiple interchangeable components to perform a single function in order to cope with failures and errors. Redundancy normally applies primarily to hardware. For example, one might install two or even three computers to do the same job. There are several ways these could be used. They could all be active all the time thus giving extra performance through parallel processing as well as extra availability; one could be active and the others simply monitoring its activity so as to be ready to take over if it failed ("warm standby"); the "spares" could be kept turned off and only switched on when needed ("cold standby"). Another common form of hardware redundancy is disk mirroring.
Redundancy can also be used to detect and recover from errors, either in hardware or software. A well known example of this is the cyclic redundancy check which adds redundant data to a block in order to detect corruption during storage or transmission. If the cost of errors is high enough, e.g. in a safety-critical system, redundancy may be used in both hardware AND software with three separate computers programmed by three separate teams and some system to check that they all produce the same answer, or some kind of majority voting system.
2. The proportion of a message's gross information content that can be eliminated without losing essential information.
Technically, redundancy is one minus the ratio of the actual uncertainty to the maximum uncertainty. This is the fraction of the structure of the message which is determined not by the choice of the sender, but rather by the accepted statistical rules governing the choice of the symbols in question.
[Shannon and Weaver, 1948, p. l3]
[Better explanation?]
(1995-05-09)
1. <parallel> The provision of multiple interchangeable components to perform a single function in order to cope with failures and errors. Redundancy normally applies primarily to hardware. For example, one might install two or even three computers to do the same job. There are several ways these could be used. They could all be active all the time thus giving extra performance through parallel processing as well as extra availability; one could be active and the others simply monitoring its activity so as to be ready to take over if it failed ("warm standby"); the "spares" could be kept turned off and only switched on when needed ("cold standby"). Another common form of hardware redundancy is disk mirroring.
Redundancy can also be used to detect and recover from errors, either in hardware or software. A well known example of this is the cyclic redundancy check which adds redundant data to a block in order to detect corruption during storage or transmission. If the cost of errors is high enough, e.g. in a safety-critical system, redundancy may be used in both hardware AND software with three separate computers programmed by three separate teams and some system to check that they all produce the same answer, or some kind of majority voting system.
2.
Technically, redundancy is one minus the ratio of the actual uncertainty to the maximum uncertainty. This is the fraction of the structure of the message which is determined not by the choice of the sender, but rather by the accepted statistical rules governing the choice of the symbols in question.
[Shannon and Weaver, 1948, p. l3]
[Better explanation?]
(1995-05-09)
| WebGuest Web Glossary |
Redundancy
Form of protection against system failures. For example, if you want to be sure that you'll always have power supply, you can set up two power supplies so that one takes over if the other one fails.
Form of protection against system failures. For example, if you want to be sure that you'll always have power supply, you can set up two power supplies so that one takes over if the other one fails.
| SAN Acronyms |
Redundancy
Having multiple occurrences of a component to maintain high availability.
Having multiple occurrences of a component to maintain high availability.
Redundancy Definition from Language, Idioms & Slang Dictionaries & Glossaries
| Webster's Revised Unabridged Dictionary (1913) |
Redundancy
(n.)
The quality or state of being redundant; superfluity; superabundance; excess.
(n.)
That which is redundant or in excess; anything superfluous or superabundant.
(n.)
Surplusage inserted in a pleading which may be rejected by the court without impairing the validity of what remains.
(n.)
The quality or state of being redundant; superfluity; superabundance; excess.
(n.)
That which is redundant or in excess; anything superfluous or superabundant.
(n.)
Surplusage inserted in a pleading which may be rejected by the court without impairing the validity of what remains.
| WordNet 2.0 |
redundancy
Noun
1. repetition of messages to reduce the probability of errors in transmission
(hypernym) repetitiveness, repetitiousness
2. the attribute of being superfluous and unneeded; "the use of industrial robots created redundancy among workers"
(synonym) redundance
(hypernym) overplus, plethora, superfluity, embarrassment
(hyponym) fifth wheel, deadwood
(derivation) redound
3. (electronics) a system design that duplicates components to provide alternatives in case one component fails
(hypernym) configuration, constellation
(classification) electronics
4. repetition of an act needlessly
(hypernym) repetition, repeating
Noun
1. repetition of messages to reduce the probability of errors in transmission
(hypernym) repetitiveness, repetitiousness
2. the attribute of being superfluous and unneeded; "the use of industrial robots created redundancy among workers"
(synonym) redundance
(hypernym) overplus, plethora, superfluity, embarrassment
(hyponym) fifth wheel, deadwood
(derivation) redound
3. (electronics) a system design that duplicates components to provide alternatives in case one component fails
(hypernym) configuration, constellation
(classification) electronics
4. repetition of an act needlessly
(hypernym) repetition, repeating
| hEnglish - advanced version |
redundancy
redundancy
redundant array of inexpensive disks
similar words(3)
longitudinal redundancy check
cyclic redundancy check
vertical redundancy check
redundancy
redundant array of inexpensive disks
similar words(3)
longitudinal redundancy check
cyclic redundancy check
vertical redundancy check
Redundancy Definition from Science & Technology Dictionaries & Glossaries
| Telecommunication Standard Terms |
redundancy
1. In the transmission of data, the excess of transmitted message symbols over that required to convey the essential information in a noise-free circuit. Note: Redundancy may be introduced intentionally (as in the case of error detection or correction codes) or inadvertently (such as by oversampling a band-limited signal, inefficient formats, etc. ). 2. In a communication system, surplus capability usually provided to improve the reliability and quality of service. (188 )
1. In the transmission of data, the excess of transmitted message symbols over that required to convey the essential information in a noise-free circuit. Note: Redundancy may be introduced intentionally (as in the case of error detection or correction codes) or inadvertently (such as by oversampling a band-limited signal, inefficient formats, etc. ). 2. In a communication system, surplus capability usually provided to improve the reliability and quality of service. (188 )
| Web Dictionary of Cybernetics and Systems |
Redundancy
one minus the ratio of the actual uncertainty to the maximum uncertainty. "This is the fraction of the structure of the message which is determined not by the choice of the sender, but rather by the accepted statistical rules governing the choice of the symbols in question." (Shannon and Weaver, 1948, p. l3)
The variety in a channel that exceeds the amount of information actually transmitted. Its most common forms: (1) repetitive transmission of the same message over one channel, (2) duplication of channels, of which each could handle the transmission by itself, (3) restrictions on the use of characters or on the combinations of characters from an alphabet to form proper words or expressions (see language ), (4) communicating something already known to its addressee. In the process of communication redundancy is essential to combat noise, to assure reliability and to maintain a communication channel. English writing is estimated to be 50% redundant which accounts for the ability of native speakers to detect and correct typing errors. Parity checks, which are common in communication within computers, enhance reliability but only at the expense of using additional channel capacity. The amount of information actually transmitted is not increased by this device. Similarly, Indian governments of the Mogul period are known to have used at least 3 parallel reporting channels to survey their provinces with some degree of reliability, notwithstanding the additional efforts. (Krippendorff )
one minus the ratio of the actual uncertainty to the maximum uncertainty. "This is the fraction of the structure of the message which is determined not by the choice of the sender, but rather by the accepted statistical rules governing the choice of the symbols in question." (Shannon and Weaver, 1948, p. l3)
The variety in a channel that exceeds the amount of information actually transmitted. Its most common forms: (1) repetitive transmission of the same message over one channel, (2) duplication of channels, of which each could handle the transmission by itself, (3) restrictions on the use of characters or on the combinations of characters from an alphabet to form proper words or expressions (see language ), (4) communicating something already known to its addressee. In the process of communication redundancy is essential to combat noise, to assure reliability and to maintain a communication channel. English writing is estimated to be 50% redundant which accounts for the ability of native speakers to detect and correct typing errors. Parity checks, which are common in communication within computers, enhance reliability but only at the expense of using additional channel capacity. The amount of information actually transmitted is not increased by this device. Similarly, Indian governments of the Mogul period are known to have used at least 3 parallel reporting channels to survey their provinces with some degree of reliability, notwithstanding the additional efforts. (Krippendorff )
Redundancy Definition from Arts & Humanities Dictionaries & Glossaries
| English-Latin Online Dictionary |
redundancy
redundantia
redundantia
Redundancy Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Redundancy
Redundancy, in general terms, refers to the quality or state of being redundant, that is: exceeding what is necessary or normal; or duplication. This can have a negative connotation, especially in rhetoric: superfluous or repetitive; or a positive implication, especially in engineering: serving as a duplicate for preventing failure of an entire system.
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