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<http://cs.dbpedia.org/resource/Fault-tolerant_system>	<http://dbpedia.org/ontology/abstract>	"Fault-tolerant system (\u010Desky syst\u00E9m odoln\u00FD proti selh\u00E1n\u00ED nebo syst\u00E9m odoln\u00FD proti chyb\u00E1m) je vlastnost, kter\u00E1 umo\u017E\u0148uje syst\u00E9mu (\u010Dasto po\u010D\u00EDta\u010Dov\u00E9mu), aby nad\u00E1le pracoval spr\u00E1vn\u011B i v p\u0159\u00EDpad\u011B selh\u00E1n\u00ED n\u011Bkter\u00E9 jeho sou\u010D\u00E1sti. Pokud se sn\u00ED\u017E\u00ED kvalita slu\u017Eby, je pokles \u00FAm\u011Brn\u00FD z\u00E1va\u017Enosti selh\u00E1n\u00ED \u2013 naopak u naivn\u011B navr\u017Een\u00E9ho syst\u00E9mu m\u016F\u017Ee i mal\u00E9 selh\u00E1n\u00ED zp\u016Fsobit \u00FApln\u00E9 zhroucen\u00ED. Odolnost proti chyb\u00E1m je velmi \u017E\u00E1douc\u00ED u syst\u00E9m\u016F s vysokou dostupnost\u00ED nebo zaji\u0161\u0165uj\u00EDc\u00EDch \u017Eivotn\u011B kritick\u00E9 funkce.Odolnost proti chyb\u00E1m nen\u00ED jen vlastnost\u00ED jednotliv\u00FDch stroj\u016F, ale m\u016F\u017Ee tak\u00E9 charakterizovat pravidla, podle kter\u00FDch vz\u00E1jemn\u011B interaguj\u00ED. Nap\u0159\u00EDklad Transmission Control Protocol je navr\u017Een tak, aby poskytoval spolehlivou obousm\u011Brnou komunikaci v s\u00EDti s p\u0159epojov\u00E1n\u00EDm paket\u016F, a to i v p\u0159\u00EDtomnosti s\u00ED\u0165ov\u00FDch prvk\u016F, kter\u00E9 jsou nedokonal\u00E9 nebo p\u0159et\u00ED\u017Een\u00E9. Protokol vy\u017Eaduje, aby koncov\u00E9 body komunikace po\u010D\u00EDtaly se ztr\u00E1tou, duplikac\u00ED, p\u0159ehozen\u00EDm a po\u0161kozen\u00EDm paket\u016F; takov\u00E9 ud\u00E1losti nenaru\u0161\u00ED integritu dat, ale pouze pom\u011Brn\u011B sn\u00ED\u017E\u00ED datovou propustnost.Struktura dat m\u016F\u017Ee b\u00FDt navr\u017Eena tak, aby umo\u017E\u0148ovala elegantn\u00ED degradaci (graceful degradation). Nap\u0159\u00EDklad form\u00E1t HTML je navr\u017Een s ohledem na dop\u0159ednou kompatibilitu: nov\u011B zav\u00E1d\u011Bn\u00E9 HTML entity mohou prohl\u00ED\u017Ee\u010De, kter\u00E9 jim nerozum\u011Bj\u00ED, prost\u011B ignorovat, ani\u017E by se dokument stal nepou\u017Eiteln\u00FDm.Obnova z chyb v syst\u00E9mu toleruj\u00EDc\u00EDm v\u00FDpadky m\u016F\u017Ee b\u00FDt charakterizov\u00E1na jako roll-forward nebo roll-back. Jakmile syst\u00E9m zjist\u00ED, \u017Ee nastala chyba, roll-forward obnova analyzuje stav syst\u00E9mu a oprav\u00ED jej. Roll-back obnova navr\u00E1t\u00ED stav syst\u00E9mu zp\u011Bt k n\u011Bkter\u00E9 z d\u0159\u00EDv\u011Bj\u0161\u00EDch korektn\u00EDch verz\u00ED, nap\u0159\u00EDklad pou\u017Eit\u00EDm bodu obnoven\u00ED. Roll-back obnova vy\u017Eaduje, aby operace mezi kontroln\u00EDm bodem a zji\u0161t\u011Bn\u00FDm chybn\u00FDm stavem byly idempotentn\u00ED. N\u011Bkter\u00E9 syst\u00E9my vyu\u017E\u00EDvaj\u00ED ob\u011B metody obnovy, roll-forward i roll-back, pro r\u016Fzn\u00E9 chyby nebo r\u016Fzn\u00E9 \u010D\u00E1sti jedn\u00E9 chyby. V r\u00E1mci individu\u00E1ln\u00EDho syst\u00E9mu, odolnosti proti chyb\u00E1m m\u016F\u017Ee b\u00FDt dosa\u017Eeno p\u0159edv\u00EDd\u00E1n\u00EDm mimo\u0159\u00E1dn\u00FDch podm\u00EDnek a tvo\u0159en\u00EDm syst\u00E9mu schopn\u00FDm vypo\u0159\u00E1dat se s nimi, a obecn\u011B, usilovat o samo-stabilizaci (self-stabilization), tak\u017Ee syst\u00E9m sm\u011B\u0159uje k bezchybov\u00E9mu stavu.Nicm\u00E9n\u011B, jestli\u017Ee jsou n\u00E1sledky selh\u00E1n\u00ED syst\u00E9mu katastrof\u00E1ln\u00ED, nebo n\u00E1klady na dostate\u010Dnou spolehlivost velmi vysok\u00E9, m\u016F\u017Ee b\u00FDt lep\u0161\u00EDm \u0159e\u0161en\u00EDm pou\u017E\u00EDt n\u011Bjakou formu zdvojen\u00ED. V ka\u017Ed\u00E9m p\u0159\u00EDpad\u011B, je-li d\u016Fsledek selh\u00E1n\u00ED syst\u00E9mu tak katastrof\u00E1ln\u00ED, syst\u00E9m mus\u00ED b\u00FDt schopen n\u00E1vr\u00E1tit se zp\u011Bt do bezpe\u010Dn\u00E9ho re\u017Eimu. To je podobn\u00E9 jako roll-back obnova, ale m\u016F\u017Ee to b\u00FDt lidsk\u00E1 akce, pokud jsou lid\u00E9 p\u0159\u00EDtomni ve smy\u010Dce."@cs .
<http://cs.dbpedia.org/resource/Fault-tolerant_system>	<http://www.w3.org/2000/01/rdf-schema#comment>	"Fault-tolerant system (\u010Desky syst\u00E9m odoln\u00FD proti selh\u00E1n\u00ED nebo syst\u00E9m odoln\u00FD proti chyb\u00E1m) je vlastnost, kter\u00E1 umo\u017E\u0148uje syst\u00E9mu (\u010Dasto po\u010D\u00EDta\u010Dov\u00E9mu), aby nad\u00E1le pracoval spr\u00E1vn\u011B i v p\u0159\u00EDpad\u011B selh\u00E1n\u00ED n\u011Bkter\u00E9 jeho sou\u010D\u00E1sti. Pokud se sn\u00ED\u017E\u00ED kvalita slu\u017Eby, je pokles \u00FAm\u011Brn\u00FD z\u00E1va\u017Enosti selh\u00E1n\u00ED \u2013 naopak u naivn\u011B navr\u017Een\u00E9ho syst\u00E9mu m\u016F\u017Ee i mal\u00E9 selh\u00E1n\u00ED zp\u016Fsobit \u00FApln\u00E9 zhroucen\u00ED."@cs .
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<http://cs.dbpedia.org/resource/Fault-tolerant_system>	<http://dbpedia.org/ontology/wikiPageWikiLinkText>	"odoln\u00FDch proti selh\u00E1n\u00ED"@cs .
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<http://cs.dbpedia.org/resource/Fault-tolerant_system>	<http://dbpedia.org/ontology/wikiPageWikiLinkText>	"poruchy toleranci"@cs .
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