{"id":91731,"date":"2020-08-17T19:42:18","date_gmt":"2020-08-17T17:42:18","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/nemnogo-o-smart-i-utilitah-dlya-monitoringa"},"modified":"2020-08-17T19:42:18","modified_gmt":"2020-08-17T17:42:18","slug":"nemnogo-o-smart-i-utilitah-dlya-monitoringa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/nemnogo-o-smart-i-utilitah-dlya-monitoringa","title":{"rendered":"Veidi SMARTist ja j\u00e4lgimisrakendustest","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Internedis on piisavalt palju teavet SMARTi ja atribuutide v\u00e4\u00e4rtuste kohta. Kuid ma ei ole kohanud mainimist mitmetest olulistest aspektidest, millest tean inimestelt, kes teevad teabeallikate uurimist.<\/p>\n

Kui ma j\u00e4rgmisel korral r\u00e4\u00e4kisin tuttavale, miks ei tohiks SMARTi n\u00e4itudele pimesi toetuda ja miks ei tasuks pidevalt kasutada klassikalisi \u00abSMARTi j\u00e4lgimisprogramme\u00bb, tuli mul m\u00f5te kirja panna \u00f6eldud s\u00f5nad koos selgitustega teesisena. Nii et saaksin viidata, selle asemel et iga kord uuesti r\u00e4\u00e4kida. Ja et tutvustada seda laiemale publikule.
\n<\/a><\/noindex>
\n1) SMARTi atribuutide automaatse j\u00e4lgimise programmidega tuleks ettevaatlikult \u00fcmber k\u00e4ia.<\/b><\/p>\n

See, mida te tuntakse SMARTi atribuutidena, ei salvestata valmis kujul, vaid genereeritakse hetkel, kui te neid p\u00e4rite. Need arvutatakse v\u00e4lja p\u00f5hinedes seadme sisestatistikale, mida jaotub ja kasutatakse salvesti t\u00f6\u00f6s. <\/p>\n

M\u00f5ned neist andmetest ei ole seadmele p\u00f5hiomaduste tagamiseks vajalikud. Need ei salvestata, vaid koostatakse iga kord, kui neid vajatakse. Seet\u00f5ttu, kui SMART atribuutide p\u00e4ring toimub, k\u00e4ivitab mikrokood suures koguses protsesse, mis on vajalikud puuduvate andmete saamiseks. <\/p>\n

Kuid need protsessid on halvasti \u00fchilduvad k\u00e4itamisprotseduuridega, mis toimuvad salvestusseadmest lugemise ja kirjutamise operatsioonide k\u00e4igus.<\/p>\n

Ideaalmaailmas ei peaks see tooma mingeid probleeme. Kuid tegelikkuses kirjutavad k\u00f5vakettade p\u00fcsivormingud tavaliselt tavalised inimesed, kes v\u00f5ivad eksida ja ka eksivad. Seet\u00f5ttu, kui te p\u00e4rite SMART atribuute aktiivsete lugemis- ja kirjutamisoperatsioonide ajal, suureneb dramaatiliselt t\u00f5en\u00e4osus, et midagi l\u00e4heb valesti. N\u00e4iteks v\u00f5ivad kasutaja lugemise v\u00f5i kirjutamise puhverandmed kahjustuda.<\/p>\n

Kinnitus riskide suurenemise kohta ei ole teoreetiline j\u00e4reldus, vaid praktiline j\u00e4lgimine. N\u00e4iteks on teada viga, mis esines HDD Samsung 103UI p\u00fcsivormingus, kus SMART atribuudi p\u00e4ringu k\u00e4igus kahjustati kasutaja andmeid.<\/p>\n

Seet\u00f5ttu \u00e4rge seadistage SMARTi atribuutide automaatset kontrollimist, kui te ei tea t\u00e4pselt, et enne seda antakse k\u00e4sk vahem\u00e4lu t\u00fchjendamiseks (Flush Cache). Kui seda on v\u00e4ltimatu teha, seadistage kontrollimise t\u00e4itmine v\u00f5imalikult harvaks. Paljudes j\u00e4lgimisprogrammides on vaikimisi aeg kontrollide vahel umbes 10 minutit. See on liiga tihti. Sellised kontrollid ei ole siiski imerohi, kui ketas ootamatult rikneb (imerohi on ainult varukoopia). \u00dcks kord p\u00e4evas on t\u00e4iesti piisav.<\/p>\n

Temperatuuri p\u00e4ring protsesside k\u00e4ivitamiseks atribuutide arvutamise k\u00e4igus ei too kaasa ja v\u00f5ib toimuda sageli. Kuna \u00f5igesti teostamisel toimub see SCT-protokolli kaudu. SCT kaudu esitatakse ainult see, mis on juba teada. Need andmed v\u00e4rskendatakse automaatselt taustal.<\/p>\n

2) SMARTi atribuutide andmed on sageli ebat\u00e4psed.<\/b><\/p>\n

K\u00f5vaketta mikroprogrammeerimine n\u00e4itab teile seda, mida ta arvab, et on vajalik n\u00e4idata, mitte seda, mis tegelikult toimub. K\u00f5ige silmatorkavam n\u00e4ide on 5. atribuut, \u00fcmber m\u00e4\u00e4ratud sektorite arv. Andmete taastamise spetsialistidele on h\u00e4sti teada, et k\u00f5vaketas v\u00f5ib viiendat atributti kuvada nullina, ehkki \u00fcmber m\u00e4\u00e4ratud sektoreid on olemas ja need j\u00e4tkavad ilmumist. <\/p>\n

K\u00fcsinud k\u00f5vakettasid uurinud spetsialistilt, kes uurib nende mikroprogramme, kuidas mikrotuuma seadistust m\u00f5jutab otsus, millal teavet sektorite \u00fcmber m\u00e4\u00e4ramisest varjata ja millal seda l\u00e4bi SMART-atribuutide jagada.<\/p>\n

Ta vastas, et \u00fchtset reeglit, mille alusel seadmed n\u00e4itavad v\u00f5i varjavad tegelikku pilti, ei eksisteeri. Ja programmerijate loogika, kes kirjutavad k\u00f5vakettaseente, tundub m\u00f5nikord v\u00e4ga kummaline. Uurides erinevate mudelite seente, n\u00e4gi ta, et sageli tehakse otsus \"varjata v\u00f5i n\u00e4idata\" p\u00f5hinedes komplektile parameetritele, mis on \u00fcldse arusaamatud ning pole koosk\u00f5las k\u00f5vaketta \u00fclej\u00e4\u00e4nud eluj\u00f5udlusega.<\/p>\n

3) SMART indikaatorite t\u00f5lgendamine on tootja spetsiifiline.<\/b><\/p>\n

N\u00e4iteks Seagate'ide puhul ei tasu t\u00e4hele panna \u201ehalbu\u201c toore v\u00e4\u00e4rtusi atribuutide 1 ja 7, kuni \u00fclej\u00e4\u00e4nud on normis. Selle tootja ketastel v\u00f5ivad nende absoluutv\u00e4\u00e4rtused normaalsete t\u00f6\u00f6tingimustes suureneda.<\/p>\n

\"Veidi
\n
\nK\u00f5vaketta seisundi ja \u00fclej\u00e4\u00e4nud eluj\u00f5udluse hindamiseks soovitatakse esmalt t\u00e4helepanu p\u00f6\u00f6rata parameetritele 5, 196, 197, 198. Samuti on m\u00f5ttekas orienteeruda just absoluutsetele, tooretele (raw) v\u00e4\u00e4rtustele, mitte nende tasandatud v\u00e4\u00e4rtustele. Atribuutide tasandamine v\u00f5ib toimuda ebaselgete viiside kaudu, mis varieeruvad erinevates algoritmides ja tarkvarades. <\/p>\n

Infos\u00fcsteemide spetsialistide seas, kui r\u00e4\u00e4gitakse atribuudi v\u00e4\u00e4rtusest, m\u00f5istetakse tavaliselt just absoluutset v\u00e4\u00e4rtust.
\n
Allikas: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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Kuid ma ei ole kohanud viiteid mitmetele olulistele aspektidele, mida tean inimestelt, kes tegelevad infos\u00fcsteemide uurimisega. Igal korral, kui r\u00e4\u00e4kisin tuttavale, miks SMARTi n\u00e4itudele ei tohi absoluutselt toetuda ja miks on parem mitte kasutada klassikalisi \"SMARTi j\u00e4lgimisprogramme\" pidevalt, tuli...","canonical_url":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/nemnogo-o-smart-i-utilitah-dlya-monitoringa","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"et_EE","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041d\u0435\u043c\u043d\u043e\u0433\u043e \u043e SMART \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u0430\u0445 \u0434\u043b\u044f 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