{"id":31906,"date":"2019-10-31T21:43:53","date_gmt":"2019-10-31T18:43:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/sokrashhenie-riskov-downtime-blagodarya-arhitekture-shared-nothing\/"},"modified":"2019-10-31T21:43:53","modified_gmt":"2019-10-31T18:43:53","slug":"sokrashhenie-riskov-downtime-blagodarya-arhitekture-shared-nothing","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/sokrashhenie-riskov-downtime-blagodarya-arhitekture-shared-nothing","title":{"rendered":"T\u00d5HUSTAMINE downtime'i riskide v\u00e4hendamisel Shared Nothing arhitektuuri abil","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Andmete salvestamise s\u00fcsteemide usaldusv\u00e4\u00e4rsuse teema on alati aktuaalne, kuna meie ajastul, mil virtuaalimine ja ressursside konsolideerimine on laialdaselt levinud, on salvestuss\u00fcsteem see komponent, mille rike toob endaga kaasa mitte ainult tavalise t\u00f5rke, vaid ka pikad teenuste seiskumised. Seet\u00f5ttu on kaasaegsetes salvestuss\u00fcsteemides mitmeid dubleeritud komponente (kuni kontrolleriteni). Kuid kas selline kaitse on piisav?<\/p>\n<p>\n<img decoding=\"async\" alt=\"T\u00d5HUSTAMINE downtime&#039;i riskide v\u00e4hendamisel Shared Nothing arhitektuuri abil\" src=\"\/wp-content\/uploads\/2019\/04\/47fc590f7b0a1f8353f61bf8461ec9b8.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>K\u00f5ik tarnijad, kes loetlevad salvestuss\u00fcsteemide omadusi, mainivad kindlasti oma lahenduste k\u00f5rget usaldusv\u00e4\u00e4rsust, lisades kindlasti termini \u201eilma \u00fchtegi rikkepunktita\u201c. Vaadakem l\u00e4hemalt t\u00fc\u00fcpilist andmesalvestuss\u00fcsteemi. Teenuste seiskumise v\u00e4ltimiseks dubleeritakse salvestuss\u00fcsteemides toiteplokid, jahutusmoodulid, sisend\/v\u00e4ljundportid, salvestid (m\u00f5tleme RAIDi) ja muidugi kontrollerid. Kui sellele arhitektuurile t\u00e4helepanelikult vaadata, v\u00f5ib m\u00e4rgata v\u00e4hemalt kahte potentsiaalset rikkepunkti, millest vaikselt vaikitakse:<\/p>\n<p><\/p>\n<ol>\n<li>\u00dcksik b\u00e4kpleini olemasolu (backplane)<\/li>\n<li>\u00dcks andmekopeerimise olemasolu<\/li>\n<\/ol>\n<p><\/p>\n<p>Backplane on keeruline tehniline seade, mis peab tootmise k\u00e4igus l\u00e4bima p\u00f5hjaliku testimise. Seet\u00f5ttu on \u00e4\u00e4rmiselt haruldane, et see t\u00e4ielikult t\u00f5rkuvad. Siiski, isegi osaliste rikete korral, nagu n\u00e4iteks mittet\u00f6\u00f6tav salvestus pesa, on vajalik selle asendamine koos kogu salvestusseadmestiku v\u00e4lja l\u00fclitamisega.<\/p>\n<p><\/p>\n<p>Mitme andmekoopia loomine ei tundu esmapilgul probleemina. N\u00e4iteks on salvestusseadmestikus (S\u0425D) laialdaselt levinud kloonimise funktsioon, mis v\u00f5imaldab perioodiliselt luua t\u00e4ismahtu andmekoopia. K\u00fcll aga, kui tekivad probleemid sama backplane'iga, on koopia ligip\u00e4\u00e4setavust sama palju piiratud kui originaali. <\/p>\n<p><\/p>\n<p>Ilmne lahendus nende probleemide \u00fcletamiseks on andmete replikatsioon teisele andmesalvestuss\u00fcsteemile. Kui ignoreerida oodatavat riistvara maksumuse kahekordistumist (kahtlemata eeldame, et selliseid lahendusi valivad inimesed m\u00f5istavad selle fakti ja arvestavad sellega ette), j\u00e4\u00e4vad alles v\u00f5imalikud kulud replikatsiooni korraldamiseks, sealhulgas litsentsid, t\u00e4iendav tarkvara ja riistvara. Ja peamine - on vajalik tagada replikatsiooniga andmete j\u00e4rjepidevus. See t\u00e4hendab, et tuleb luua andmesalvestusvirtualiseerija, n\u00e4iteks vSAN, mis samuti n\u00f5uab rahalisi ja ajakulu ressursse.<\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/\">AccelStor <\/a><\/noindex>Oma k\u00f5rge k\u00e4ttesaadavuse s\u00fcsteemide loomisel seadsime eesm\u00e4rgiks vabaneda \u00fclalmainitud puudustest. Nii tekkis tehnoloogia Shared Nothing t\u00f5lgendus, mis vabalt t\u00f5lkides t\u00e4hendab \"ilma jagatud seadmete kasutamiseta\".<\/p>\n<p><\/p>\n<p>Kontseptsioon <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/modeli-vysokoj-dostupnosti-ha\">Shared Nothing<\/a><\/noindex> Arhitektuur t\u00e4hendab kahe s\u00f5ltumatu nodi (kontrolleri) kasutamist, millest iga\u00fchel on oma andmestik. Nodide vahel toimub s\u00fcnkroonne replikatsioon InfiniBand 56G kaudu, mis on t\u00e4iesti l\u00e4bipaistev tarkvarale, mis t\u00f6\u00f6tab salvestuss\u00fcsteemi peal. Seet\u00f5ttu pole vajalik virtuaalsete andmesalvestuse seadmete, tarkvaraliideste jmt kasutamine.<\/p>\n<p><\/p>\n<p>F\u00fc\u00fcsiliselt v\u00f5ib AccelStori kahekordne lahendus olla teostatud kahes mudelis:<\/p>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/product\/neosapphire-h510\">H510<\/a><\/noindex> \u2014 Twin serverite baasilt 2U korpuses, kui n\u00f5utakse m\u00f5\u00f5dukat j\u00f5udlust ja salvestusmahtu kuni 22TB;<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/product\/neosapphire-h710\">H710<\/a><\/noindex> \u2014 Eraldi 2U serverite baasilt, kui n\u00f5utakse k\u00f5rget j\u00f5udlust ja suurt salvestusmahtu (kuni 57TB).<\/li>\n<\/ul>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"T\u00d5HUSTAMINE downtime&#039;i riskide v\u00e4hendamisel Shared Nothing arhitektuuri abil\" src=\"\/wp-content\/uploads\/2019\/04\/58d7600872e0ffcb5c87795c80de2c32.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Twin serveri baasil p\u00f5hinev mudel H510<\/i><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"T\u00d5HUSTAMINE downtime&#039;i riskide v\u00e4hendamisel Shared Nothing arhitektuuri abil\" src=\"\/wp-content\/uploads\/2019\/04\/0c6aae3bbca60536aaeb1cd92dd86ce8.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><i>Eraldi serverite baasil p\u00f5hinev mudel H710<\/i><\/p>\n<p><\/p>\n<p>Erinevate vormifaktorite kasutamine on tingitud vajadusest erineva arvu SSD-de j\u00e4rele, et saavutada soovitud maht ja j\u00f5udlus. Pluss, Twin platvorm on odavam ja v\u00f5imaldab pakkuda taskukohasemaid lahendusi, kuigi tingimisi on see \"puudus\" ainulaadse b\u0259kpleini n\u00e4ol. K\u00f5ik muu, sealhulgas t\u00f6\u00f6p\u00f5him\u00f5tted, on m\u00f5lemal mudelil t\u00e4ielikult identne.<\/p>\n<p><\/p>\n<p>Igal s\u00f5lmel on andmekogudel kaks gruppi <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-technology\">FlexiRemap<\/a><\/noindex>, pluss 2 hot spare. Iga grupp suudab taluda \u00fche SSD rikke. K\u00f5ik kirjutamisettepanekud suunatakse s\u00f5lmele vastavalt <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-advantages\">filosoofiale<\/a><\/noindex> FlexiRemap muudab need j\u00e4rjestikusteks ahelateks 4KB plokkidega, mis seej\u00e4rel kirjutatakse SSD-le maksimaalselt mugaval viisil (j\u00e4rjestikune kirjutamine). Samuti antakse hostile kirjutamise kinnitus alles p\u00e4rast andmete f\u00fc\u00fcsilist paigutamist SSD-le, st ilma RAM-is vahem\u00e4llu salvestamata. Selle tulemusena saavutatakse muljetavaldav j\u00f5udlus, ulatudes 600K IOPS kirjutamise puhul ja 1M+ IOPS lugemise puhul (mudel H710).<\/p>\n<p><\/p>\n<p>Nagu varem mainitud, toimub andmekogude s\u00fcnkroniseerimine reaalajas lehe InfiniBand 56G kaudu, millel on k\u00f5rge l\u00e4bilaskev\u00f5ime ja madalad latentsused. Et maksimaalselt kasutada sidekanalit v\u00e4ikeste pakettide edastamisel. Kuna sidekanal on \u00fcks, kasutatakse t\u00e4iendava pulsi kontrollimiseks eraldi 1GbE liidest. Selles edastatakse ainult s\u00fcdamepekslemine, seet\u00f5ttu ei ole kiirusn\u00f5udeid.<\/p>\n<p><\/p>\n<p>Kui s\u00fcsteemi mahtu (kuni 400+ TB) suurendatakse <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/moduli-rasshireniya\">laienemisraamid<\/a><\/noindex> \u00fchendatakse need ka paarides, et j\u00e4rgida p\u00f5him\u00f5tet \u00abilma \u00fchtse rikkepunktita\u00bb.<\/p>\n<p><\/p>\n<p>Andmete t\u00e4iendava kaitse tagamiseks (peale selle, et AccelStor\u2019il on juba kaks koopiat) kasutatakse spetsiaalset algoritmi, mis m\u00e4\u00e4rab k\u00e4itumise, kui m\u00f5ni SSD eba\u00f5nnestub. Kui SSD katkeb, k\u00e4ivitab s\u00f5lme andmete taastamise \u00fche kuuma varukoopia kettale. Degradeeritud olekus FlexiRemap grupp l\u00e4heb ainult lugemisre\u017eiimi. See tehakse, et v\u00e4ltida kirjutamis- ja taastamisoperatsioonide sekkumist varukoopiadiskile, mis l\u00f5puks kiirendab taastamisprotsessi ja l\u00fchendab aega, mil s\u00fcsteem on potentsiaalselt haavatav. Taastamisprotsessi l\u00f5ppedes naaseb s\u00f5lm normaalsesse lugemise-kirjutamise re\u017eiimi. <\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"T\u00d5HUSTAMINE downtime&#039;i riskide v\u00e4hendamisel Shared Nothing arhitektuuri abil\" src=\"\/wp-content\/uploads\/2019\/04\/8e0d67ff4d803f575e007df424b8ba14.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Muidugi, nagu ka teistel s\u00fcsteemidel, v\u00e4heneb taastamise ajal \u00fcldine j\u00f5udlus (sest \u00fcks FlexiRemap grupp ei toimi kirjutamisel). Kuid kogu taastamisprotsess toimub v\u00f5imalikult kiiresti, mis eristab AccelStor\u2019i s\u00fcsteeme teiste m\u00fc\u00fcjate lahendustest.<\/p>\n<p><\/p>\n<p>\u00dcks teine kasulik omadus Nothing Shared tehnoloogias on s\u00f5lmede t\u00f6\u00f6 korraldamine nn true active-active re\u017eiimis. Erinevalt \"klassikalisest\" arhitektuurist, kus konkreetse mahuti\/pooliga tegeleb ainult \u00fcks kontroller, samas kui teine lihtsalt teostab sisendi\/v\u00e4ljundi toiminguid, t\u00f6\u00f6tavad s\u00fcsteemides <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/\">AccelStor<\/a><\/noindex> iga s\u00f5lm oma andmekogudega ja ei edasta p\u00e4ringuid \"naabrile\". Selle tulemusena suureneb s\u00fcsteemi \u00fcldine j\u00f5udlus s\u00f5lmede kaudu toimuva samaaegse sisendi\/v\u00e4ljundi t\u00f6\u00f6tlemise ja salvestusdetailide ligip\u00e4\u00e4su t\u00f5ttu. Samuti on sisuliselt puuduv m\u00f5isted nagu failover, kuna mahutite juhtimine teisele s\u00f5lmele h\u00e4ire korral ei ole lihtsalt vajalik.<\/p>\n<p><\/p>\n<p>Kui v\u00f5rrelda Nothing Shared arhitektuuri tehnoloogiat t\u00e4ieliku andmebaasi dubleerimisega, siis esmapilgul j\u00e4\u00e4b see paindlikkuse osas pisut alla t\u00e4ielikult rakendatud h\u00e4daabiv\u00f5imekusele. Eriti puudutab see andmestike vahelise \u00fchenduse loomise korraldamist. N\u00e4iteks H710 mudelis on v\u00f5imalik node'id paigutada kuni 100 meetri kaugusele, kasutades mitte just odavaid aktiivseid optilisi InfiniBand kaableid. Kuid isegi kui v\u00f5rrelda tavalise s\u00fcnkroonse replikatsiooni rakendusega teistelt tarnijatelt, kasutades kergesti k\u00e4tte saadavat FibreChannel'i, isegi suuremate vahemaade puhul, osutub AccelStori lahendus odavamaks ja lihtsamaks installatsiooniks\/haldamiseks, kuna virtuaalsete andmete dubleerijate paigaldamine ja\/v\u00f5i tarkvaraga integreerimine ei ole alati p\u00f5him\u00f5tteliselt v\u00f5imalik. Pluss, \u00e4rgem unustagem, et AccelStori lahendused on All Flash maatriksid, mille j\u00f5udlus \u00fcletab klassikaliste SSD-only andmebaaside omadusi.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"T\u00d5HUSTAMINE downtime&#039;i riskide v\u00e4hendamisel Shared Nothing arhitektuuri abil\" src=\"\/wp-content\/uploads\/2019\/04\/46d39a96eedcd20e5ddcac2dc1301411.jpeg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<blockquote><p>Kasutades AccelStori tehnoloogiat Nothing Shared, on t\u00f5eliselt v\u00f5imalik saavutada salvestuss\u00fcsteemi k\u00e4ttesaadavus 99,9999% tasemel m\u00f5istlikku hinda. Koos lahenduse k\u00f5rge usaldusv\u00e4\u00e4rsusega, sealhulgas kahe andmekopeeringu kasutamise t\u00f5ttu, ja muljetavaldava j\u00f5udlusega t\u00e4nu patenteeritud algoritmidele. <noindex><a rel=\"nofollow\" href=\"http:\/\/accelstor.ru\/page\/flexiremap-technology\">FlexiRemap<\/a><\/noindex>, lahendused <noindex><a rel=\"nofollow\" href=\"https:\/\/www.accelstor.com\/\">AccelStor<\/a><\/noindex> on suurep\u00e4rased kandidaadid kaasaegse andakeskuse \u00fclesehitamise v\u00f5tmepositsioonidele.<\/p><\/blockquote>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/accelstor\/blog\/441780\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0422\u0435\u043c\u0430 \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432\u0441\u0435\u0433\u0434\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439, \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u0432 \u043d\u0430\u0448 \u0432\u0435\u043a \u043f\u043e\u0432\u0441\u0435\u043c\u0435\u0441\u0442\u043d\u043e\u0439 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0438 \u043a\u043e\u043d\u0441\u043e\u043b\u0438\u0434\u0430\u0446\u0438\u0438 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u0421\u0425\u0414 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043c \u0437\u0432\u0435\u043d\u043e\u043c, \u043e\u0442\u043a\u0430\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u0442 \u043d\u0435 \u043f\u0440\u043e\u0441\u0442\u043e \u043a \u0437\u0430\u0443\u0440\u044f\u0434\u043d\u043e\u0439 \u0430\u0432\u0430\u0440\u0438\u0438, \u0430 \u043a \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u044f\u043c \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u0421\u0425\u0414 \u0438\u043c\u0435\u044e\u0442 \u0432 \u0441\u0432\u043e\u0435\u043c \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u0434\u0443\u0431\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442 (\u0432\u043f\u043b\u043e\u0442\u044c \u0434\u043e \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u043e\u0432). \u041d\u043e \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u0430 \u043b\u0438 \u0442\u0430\u043a\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430? \u0410\u0431\u0441\u043e\u043b\u044e\u0442\u043d\u043e \u0432\u0441\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":23766,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-31906","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0422\u0435\u043c\u0430 \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432\u0441\u0435\u0433\u0434\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0430\u043a\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439, \u043f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 \u0432 \u043d\u0430\u0448 \u0432\u0435\u043a \u043f\u043e\u0432\u0441\u0435\u043c\u0435\u0441\u0442\u043d\u043e\u0439 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0438 \u043a\u043e\u043d\u0441\u043e\u043b\u0438\u0434\u0430\u0446\u0438\u0438 \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432 \u0421\u0425\u0414 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u0435\u043c \u0437\u0432\u0435\u043d\u043e\u043c, \u043e\u0442\u043a\u0430\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u0442 \u043d\u0435 \u043f\u0440\u043e\u0441\u0442\u043e \u043a \u0437\u0430\u0443\u0440\u044f\u0434\u043d\u043e\u0439 \u0430\u0432\u0430\u0440\u0438\u0438, \u0430 \u043a \u0434\u043b\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u044f\u043c \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432. \u041f\u043e\u044d\u0442\u043e\u043c\u0443 \u0441\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0435 \u0421\u0425\u0414 \u0438\u043c\u0435\u044e\u0442 \u0432 \u0441\u0432\u043e\u0435\u043c \u0441\u043e\u0441\u0442\u0430\u0432\u0435 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u0434\u0443\u0431\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442 (\u0432\u043f\u043b\u043e\u0442\u044c \u0434\u043e \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u043e\u0432). \u041d\u043e \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u0430 \u043b\u0438 \u0442\u0430\u043a\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430? 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